1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2002 Michael Shalayeff.
5 * Copyright (c) 2003 Ryan McBride.
6 * Copyright (c) 2011 Gleb Smirnoff <glebius@FreeBSD.org>
7 * All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21 * IN NO EVENT SHALL THE AUTHOR OR HIS RELATIVES BE LIABLE FOR ANY DIRECT,
22 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
23 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
24 * SERVICES; LOSS OF MIND, USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
26 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
27 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
28 * THE POSSIBILITY OF SUCH DAMAGE.
29 */
30
31 #include <sys/cdefs.h>
32 #include "opt_bpf.h"
33 #include "opt_inet.h"
34 #include "opt_inet6.h"
35
36 #include <sys/param.h>
37 #include <sys/systm.h>
38 #include <sys/devctl.h>
39 #include <sys/jail.h>
40 #include <sys/kassert.h>
41 #include <sys/kernel.h>
42 #include <sys/limits.h>
43 #include <sys/malloc.h>
44 #include <sys/mbuf.h>
45 #include <sys/module.h>
46 #include <sys/priv.h>
47 #include <sys/proc.h>
48 #include <sys/socket.h>
49 #include <sys/sockio.h>
50 #include <sys/sysctl.h>
51 #include <sys/syslog.h>
52 #include <sys/taskqueue.h>
53 #include <sys/counter.h>
54
55 #include <net/ethernet.h>
56 #include <net/if.h>
57 #include <net/if_var.h>
58 #include <net/if_dl.h>
59 #include <net/if_llatbl.h>
60 #include <net/if_private.h>
61 #include <net/if_types.h>
62 #include <net/route.h>
63 #include <net/vnet.h>
64
65 #if defined(INET) || defined(INET6)
66 #include <netinet/in.h>
67 #include <netinet/in_var.h>
68 #include <netinet/ip_carp.h>
69 #include <netinet/ip_carp_nl.h>
70 #include <netinet/ip.h>
71 #include <machine/in_cksum.h>
72 #endif
73 #ifdef INET
74 #include <netinet/ip_var.h>
75 #include <netinet/if_ether.h>
76 #endif
77
78 #ifdef INET6
79 #include <netinet/icmp6.h>
80 #include <netinet/ip6.h>
81 #include <netinet6/in6_var.h>
82 #include <netinet6/ip6_var.h>
83 #include <netinet6/scope6_var.h>
84 #include <netinet6/nd6.h>
85 #endif
86
87 #include <netlink/netlink.h>
88 #include <netlink/netlink_ctl.h>
89 #include <netlink/netlink_generic.h>
90 #include <netlink/netlink_message_parser.h>
91
92 #include <crypto/sha1.h>
93
94 static MALLOC_DEFINE(M_CARP, "CARP", "CARP addresses");
95
96 struct carp_softc {
97 struct ifnet *sc_carpdev; /* Pointer to parent ifnet. */
98 struct ifaddr **sc_ifas; /* Our ifaddrs. */
99 carp_version_t sc_version; /* carp or VRRPv3 */
100 uint8_t sc_addr[ETHER_ADDR_LEN]; /* Our link level address. */
101 struct callout sc_ad_tmo; /* Advertising timeout. */
102 #ifdef INET
103 struct callout sc_md_tmo; /* Master down timeout. */
104 #endif
105 #ifdef INET6
106 struct callout sc_md6_tmo; /* XXX: Master down timeout. */
107 #endif
108 struct mtx sc_mtx;
109
110 int sc_vhid;
111 union {
112 struct { /* sc_version == CARP_VERSION_CARP */
113 int sc_advskew;
114 int sc_advbase;
115 struct in_addr sc_carpaddr;
116 struct in6_addr sc_carpaddr6;
117 uint64_t sc_counter;
118 bool sc_init_counter;
119 #define CARP_HMAC_PAD 64
120 unsigned char sc_key[CARP_KEY_LEN];
121 unsigned char sc_pad[CARP_HMAC_PAD];
122 SHA1_CTX sc_sha1;
123 };
124 struct { /* sc_version == CARP_VERSION_VRRPv3 */
125 uint8_t sc_vrrp_prio;
126 uint16_t sc_vrrp_adv_inter;
127 uint16_t sc_vrrp_master_inter;
128 };
129 };
130 int sc_naddrs;
131 int sc_naddrs6;
132 int sc_ifasiz;
133 enum { INIT = 0, BACKUP, MASTER } sc_state;
134 int sc_suppress;
135 int sc_sendad_errors;
136 #define CARP_SENDAD_MAX_ERRORS 3
137 int sc_sendad_success;
138 #define CARP_SENDAD_MIN_SUCCESS 3
139
140 TAILQ_ENTRY(carp_softc) sc_list; /* On the carp_if list. */
141 LIST_ENTRY(carp_softc) sc_next; /* On the global list. */
142 };
143
144 struct carp_if {
145 #ifdef INET
146 int cif_naddrs;
147 #endif
148 #ifdef INET6
149 int cif_naddrs6;
150 #endif
151 TAILQ_HEAD(, carp_softc) cif_vrs;
152 #ifdef INET
153 struct ip_moptions cif_imo;
154 #endif
155 #ifdef INET6
156 struct ip6_moptions cif_im6o;
157 #endif
158 struct ifnet *cif_ifp;
159 struct mtx cif_mtx;
160 uint32_t cif_flags;
161 #define CIF_PROMISC 0x00000001
162 };
163
164 /* Kernel equivalent of struct carpreq, but with more fields for new features.
165 * */
166 struct carpkreq {
167 int carpr_count;
168 int carpr_vhid;
169 int carpr_state;
170 int carpr_advskew;
171 int carpr_advbase;
172 unsigned char carpr_key[CARP_KEY_LEN];
173 /* Everything above this is identical to carpreq */
174 struct in_addr carpr_addr;
175 struct in6_addr carpr_addr6;
176 carp_version_t carpr_version;
177 uint8_t carpr_vrrp_priority;
178 uint16_t carpr_vrrp_adv_inter;
179 };
180
181 /*
182 * Brief design of carp(4).
183 *
184 * Any carp-capable ifnet may have a list of carp softcs hanging off
185 * its ifp->if_carp pointer. Each softc represents one unique virtual
186 * host id, or vhid. The softc has a back pointer to the ifnet. All
187 * softcs are joined in a global list, which has quite limited use.
188 *
189 * Any interface address that takes part in CARP negotiation has a
190 * pointer to the softc of its vhid, ifa->ifa_carp. That could be either
191 * AF_INET or AF_INET6 address.
192 *
193 * Although, one can get the softc's backpointer to ifnet and traverse
194 * through its ifp->if_addrhead queue to find all interface addresses
195 * involved in CARP, we keep a growable array of ifaddr pointers. This
196 * allows us to avoid grabbing the IF_ADDR_LOCK() in many traversals that
197 * do calls into the network stack, thus avoiding LORs.
198 *
199 * Locking:
200 *
201 * Each softc has a lock sc_mtx. It is used to synchronise carp_input_c(),
202 * callout-driven events and ioctl()s.
203 *
204 * To traverse the list of softcs on an ifnet we use CIF_LOCK() or carp_sx.
205 * To traverse the global list we use the mutex carp_mtx.
206 *
207 * Known issues with locking:
208 *
209 * - Sending ad, we put the pointer to the softc in an mtag, and no reference
210 * counting is done on the softc.
211 * - On module unload we may race (?) with packet processing thread
212 * dereferencing our function pointers.
213 */
214
215 /* Accept incoming CARP packets. */
216 VNET_DEFINE_STATIC(int, carp_allow) = 1;
217 #define V_carp_allow VNET(carp_allow)
218
219 /* Set DSCP in outgoing CARP packets. */
220 VNET_DEFINE_STATIC(int, carp_dscp) = 56;
221 #define V_carp_dscp VNET(carp_dscp)
222
223 /* Preempt slower nodes. */
224 VNET_DEFINE_STATIC(int, carp_preempt) = 0;
225 #define V_carp_preempt VNET(carp_preempt)
226
227 /* Log level. */
228 VNET_DEFINE_STATIC(int, carp_log) = 1;
229 #define V_carp_log VNET(carp_log)
230
231 /* Global advskew demotion. */
232 VNET_DEFINE_STATIC(int, carp_demotion) = 0;
233 #define V_carp_demotion VNET(carp_demotion)
234
235 /* Send error demotion factor. */
236 VNET_DEFINE_STATIC(int, carp_senderr_adj) = CARP_MAXSKEW;
237 #define V_carp_senderr_adj VNET(carp_senderr_adj)
238
239 /* Iface down demotion factor. */
240 VNET_DEFINE_STATIC(int, carp_ifdown_adj) = CARP_MAXSKEW;
241 #define V_carp_ifdown_adj VNET(carp_ifdown_adj)
242
243 static int carp_allow_sysctl(SYSCTL_HANDLER_ARGS);
244 static int carp_dscp_sysctl(SYSCTL_HANDLER_ARGS);
245 static int carp_demote_adj_sysctl(SYSCTL_HANDLER_ARGS);
246
247 SYSCTL_NODE(_net_inet, IPPROTO_CARP, carp, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
248 "CARP");
249 SYSCTL_PROC(_net_inet_carp, OID_AUTO, allow,
250 CTLFLAG_VNET | CTLTYPE_INT | CTLFLAG_RWTUN | CTLFLAG_NOFETCH | CTLFLAG_MPSAFE,
251 &VNET_NAME(carp_allow), 0, carp_allow_sysctl, "I",
252 "Accept incoming CARP packets");
253 SYSCTL_PROC(_net_inet_carp, OID_AUTO, dscp,
254 CTLFLAG_VNET | CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
255 0, 0, carp_dscp_sysctl, "I",
256 "DSCP value for carp packets");
257 SYSCTL_INT(_net_inet_carp, OID_AUTO, preempt, CTLFLAG_VNET | CTLFLAG_RW,
258 &VNET_NAME(carp_preempt), 0, "High-priority backup preemption mode");
259 SYSCTL_INT(_net_inet_carp, OID_AUTO, log, CTLFLAG_VNET | CTLFLAG_RW,
260 &VNET_NAME(carp_log), 0, "CARP log level");
261 SYSCTL_PROC(_net_inet_carp, OID_AUTO, demotion,
262 CTLFLAG_VNET | CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
263 0, 0, carp_demote_adj_sysctl, "I",
264 "Adjust demotion factor (skew of advskew)");
265 SYSCTL_INT(_net_inet_carp, OID_AUTO, senderr_demotion_factor,
266 CTLFLAG_VNET | CTLFLAG_RW,
267 &VNET_NAME(carp_senderr_adj), 0, "Send error demotion factor adjustment");
268 SYSCTL_INT(_net_inet_carp, OID_AUTO, ifdown_demotion_factor,
269 CTLFLAG_VNET | CTLFLAG_RW,
270 &VNET_NAME(carp_ifdown_adj), 0,
271 "Interface down demotion factor adjustment");
272
273 VNET_PCPUSTAT_DEFINE(struct carpstats, carpstats);
274 VNET_PCPUSTAT_SYSINIT(carpstats);
275 VNET_PCPUSTAT_SYSUNINIT(carpstats);
276
277 #define CARPSTATS_ADD(name, val) \
278 counter_u64_add(VNET(carpstats)[offsetof(struct carpstats, name) / \
279 sizeof(uint64_t)], (val))
280 #define CARPSTATS_INC(name) CARPSTATS_ADD(name, 1)
281
282 SYSCTL_VNET_PCPUSTAT(_net_inet_carp, OID_AUTO, stats, struct carpstats,
283 carpstats, "CARP statistics (struct carpstats, netinet/ip_carp.h)");
284
285 #define CARP_LOCK_INIT(sc) mtx_init(&(sc)->sc_mtx, "carp_softc", \
286 NULL, MTX_DEF)
287 #define CARP_LOCK_DESTROY(sc) mtx_destroy(&(sc)->sc_mtx)
288 #define CARP_LOCK_ASSERT(sc) mtx_assert(&(sc)->sc_mtx, MA_OWNED)
289 #define CARP_LOCK(sc) mtx_lock(&(sc)->sc_mtx)
290 #define CARP_UNLOCK(sc) mtx_unlock(&(sc)->sc_mtx)
291 #define CIF_LOCK_INIT(cif) mtx_init(&(cif)->cif_mtx, "carp_if", \
292 NULL, MTX_DEF)
293 #define CIF_LOCK_DESTROY(cif) mtx_destroy(&(cif)->cif_mtx)
294 #define CIF_LOCK_ASSERT(cif) mtx_assert(&(cif)->cif_mtx, MA_OWNED)
295 #define CIF_LOCK(cif) mtx_lock(&(cif)->cif_mtx)
296 #define CIF_UNLOCK(cif) mtx_unlock(&(cif)->cif_mtx)
297 #define CIF_FREE(cif) do { \
298 CIF_LOCK(cif); \
299 if (TAILQ_EMPTY(&(cif)->cif_vrs)) \
300 carp_free_if(cif); \
301 else \
302 CIF_UNLOCK(cif); \
303 } while (0)
304
305 #define CARP_LOG(...) do { \
306 if (V_carp_log > 0) \
307 log(LOG_INFO, "carp: " __VA_ARGS__); \
308 } while (0)
309
310 #define CARP_DEBUG(...) do { \
311 if (V_carp_log > 1) \
312 log(LOG_DEBUG, __VA_ARGS__); \
313 } while (0)
314
315 #define IFNET_FOREACH_IFA(ifp, ifa) \
316 CK_STAILQ_FOREACH((ifa), &(ifp)->if_addrhead, ifa_link) \
317 if ((ifa)->ifa_carp != NULL)
318
319 #define CARP_FOREACH_IFA(sc, ifa) \
320 CARP_LOCK_ASSERT(sc); \
321 for (int _i = 0; \
322 _i < (sc)->sc_naddrs + (sc)->sc_naddrs6 && \
323 ((ifa) = sc->sc_ifas[_i]) != NULL; \
324 ++_i)
325
326 #define IFNET_FOREACH_CARP(ifp, sc) \
327 KASSERT(mtx_owned(&ifp->if_carp->cif_mtx) || \
328 sx_xlocked(&carp_sx), ("cif_vrs not locked")); \
329 TAILQ_FOREACH((sc), &(ifp)->if_carp->cif_vrs, sc_list)
330
331 #define DEMOTE_ADVSKEW(sc) \
332 (((sc)->sc_advskew + V_carp_demotion > CARP_MAXSKEW) ? \
333 CARP_MAXSKEW : \
334 (((sc)->sc_advskew + V_carp_demotion < 0) ? \
335 0 : ((sc)->sc_advskew + V_carp_demotion)))
336
337 static void carp_input_c(struct mbuf *, struct carp_header *, sa_family_t, int);
338 static void vrrp_input_c(struct mbuf *, int, sa_family_t, int, int, uint16_t);
339 static struct carp_softc
340 *carp_alloc(struct ifnet *, carp_version_t, int);
341 static void carp_destroy(struct carp_softc *);
342 static struct carp_if
343 *carp_alloc_if(struct ifnet *);
344 static void carp_free_if(struct carp_if *);
345 static void carp_set_state(struct carp_softc *, int, const char* reason);
346 static void carp_sc_state(struct carp_softc *);
347 static void carp_setrun(struct carp_softc *, sa_family_t);
348 static void carp_master_down(void *);
349 static void carp_master_down_locked(struct carp_softc *,
350 const char* reason);
351 static void carp_send_ad_locked(struct carp_softc *);
352 static void vrrp_send_ad_locked(struct carp_softc *);
353 static void carp_addroute(struct carp_softc *);
354 static void carp_ifa_addroute(struct ifaddr *);
355 static void carp_delroute(struct carp_softc *);
356 static void carp_ifa_delroute(struct ifaddr *);
357 static void carp_send_ad_all(void *, int);
358 static void carp_demote_adj(int, char *);
359
360 static LIST_HEAD(, carp_softc) carp_list;
361 static struct mtx carp_mtx;
362 static struct sx carp_sx;
363 static struct task carp_sendall_task =
364 TASK_INITIALIZER(0, carp_send_ad_all, NULL);
365
366 static int
carp_is_supported_if(if_t ifp)367 carp_is_supported_if(if_t ifp)
368 {
369 if (ifp == NULL)
370 return (ENXIO);
371
372 switch (ifp->if_type) {
373 case IFT_ETHER:
374 case IFT_L2VLAN:
375 case IFT_BRIDGE:
376 break;
377 default:
378 return (EOPNOTSUPP);
379 }
380
381 return (0);
382 }
383
384 static void
carp_hmac_prepare(struct carp_softc * sc)385 carp_hmac_prepare(struct carp_softc *sc)
386 {
387 uint8_t version = CARP_VERSION_CARP, type = CARP_ADVERTISEMENT;
388 uint8_t vhid = sc->sc_vhid & 0xff;
389 struct ifaddr *ifa;
390 int i, found;
391 #ifdef INET
392 struct in_addr last, cur, in;
393 #endif
394 #ifdef INET6
395 struct in6_addr last6, cur6, in6;
396 #endif
397
398 CARP_LOCK_ASSERT(sc);
399 MPASS(sc->sc_version == CARP_VERSION_CARP);
400
401 /* Compute ipad from key. */
402 bzero(sc->sc_pad, sizeof(sc->sc_pad));
403 bcopy(sc->sc_key, sc->sc_pad, sizeof(sc->sc_key));
404 for (i = 0; i < sizeof(sc->sc_pad); i++)
405 sc->sc_pad[i] ^= 0x36;
406
407 /* Precompute first part of inner hash. */
408 SHA1Init(&sc->sc_sha1);
409 SHA1Update(&sc->sc_sha1, sc->sc_pad, sizeof(sc->sc_pad));
410 SHA1Update(&sc->sc_sha1, (void *)&version, sizeof(version));
411 SHA1Update(&sc->sc_sha1, (void *)&type, sizeof(type));
412 SHA1Update(&sc->sc_sha1, (void *)&vhid, sizeof(vhid));
413 #ifdef INET
414 cur.s_addr = 0;
415 do {
416 found = 0;
417 last = cur;
418 cur.s_addr = 0xffffffff;
419 CARP_FOREACH_IFA(sc, ifa) {
420 in.s_addr = ifatoia(ifa)->ia_addr.sin_addr.s_addr;
421 if (ifa->ifa_addr->sa_family == AF_INET &&
422 ntohl(in.s_addr) > ntohl(last.s_addr) &&
423 ntohl(in.s_addr) < ntohl(cur.s_addr)) {
424 cur.s_addr = in.s_addr;
425 found++;
426 }
427 }
428 if (found)
429 SHA1Update(&sc->sc_sha1, (void *)&cur, sizeof(cur));
430 } while (found);
431 #endif /* INET */
432 #ifdef INET6
433 memset(&cur6, 0, sizeof(cur6));
434 do {
435 found = 0;
436 last6 = cur6;
437 memset(&cur6, 0xff, sizeof(cur6));
438 CARP_FOREACH_IFA(sc, ifa) {
439 in6 = ifatoia6(ifa)->ia_addr.sin6_addr;
440 if (IN6_IS_SCOPE_EMBED(&in6))
441 in6.s6_addr16[1] = 0;
442 if (ifa->ifa_addr->sa_family == AF_INET6 &&
443 memcmp(&in6, &last6, sizeof(in6)) > 0 &&
444 memcmp(&in6, &cur6, sizeof(in6)) < 0) {
445 cur6 = in6;
446 found++;
447 }
448 }
449 if (found)
450 SHA1Update(&sc->sc_sha1, (void *)&cur6, sizeof(cur6));
451 } while (found);
452 #endif /* INET6 */
453
454 /* convert ipad to opad */
455 for (i = 0; i < sizeof(sc->sc_pad); i++)
456 sc->sc_pad[i] ^= 0x36 ^ 0x5c;
457 }
458
459 static void
carp_hmac_generate(struct carp_softc * sc,uint32_t counter[2],unsigned char md[20])460 carp_hmac_generate(struct carp_softc *sc, uint32_t counter[2],
461 unsigned char md[20])
462 {
463 SHA1_CTX sha1ctx;
464
465 CARP_LOCK_ASSERT(sc);
466
467 /* fetch first half of inner hash */
468 bcopy(&sc->sc_sha1, &sha1ctx, sizeof(sha1ctx));
469
470 SHA1Update(&sha1ctx, (void *)counter, sizeof(sc->sc_counter));
471 SHA1Final(md, &sha1ctx);
472
473 /* outer hash */
474 SHA1Init(&sha1ctx);
475 SHA1Update(&sha1ctx, sc->sc_pad, sizeof(sc->sc_pad));
476 SHA1Update(&sha1ctx, md, 20);
477 SHA1Final(md, &sha1ctx);
478 }
479
480 static int
carp_hmac_verify(struct carp_softc * sc,uint32_t counter[2],unsigned char md[20])481 carp_hmac_verify(struct carp_softc *sc, uint32_t counter[2],
482 unsigned char md[20])
483 {
484 unsigned char md2[20];
485
486 CARP_LOCK_ASSERT(sc);
487
488 carp_hmac_generate(sc, counter, md2);
489
490 return (bcmp(md, md2, sizeof(md2)));
491 }
492
493 static int
vrrp_checksum_verify(struct mbuf * m,int off,int len,uint16_t phdrcksum)494 vrrp_checksum_verify(struct mbuf *m, int off, int len, uint16_t phdrcksum)
495 {
496 uint16_t cksum;
497
498 /*
499 * Note that VRRPv3 checksums are different from CARP checksums.
500 * Carp just calculates the checksum over the packet.
501 * VRRPv3 includes the pseudo-header checksum as well.
502 */
503 cksum = in_cksum_skip(m, off + len, off);
504 cksum -= phdrcksum;
505
506 return (cksum);
507 }
508
509 /*
510 * process input packet.
511 * we have rearranged checks order compared to the rfc,
512 * but it seems more efficient this way or not possible otherwise.
513 */
514 #ifdef INET
515 static int
carp_input(struct mbuf ** mp,int * offp,int proto)516 carp_input(struct mbuf **mp, int *offp, int proto)
517 {
518 struct mbuf *m = *mp;
519 struct ip *ip;
520 struct vrrpv3_header *vh;
521 int iplen;
522 int minlen;
523 int totlen;
524
525 iplen = *offp;
526 *mp = NULL;
527
528 CARPSTATS_INC(carps_ipackets);
529
530 if (!V_carp_allow) {
531 m_freem(m);
532 return (IPPROTO_DONE);
533 }
534
535 /* Ensure we have enough header to figure out the version. */
536 if (m->m_pkthdr.len < iplen + sizeof(*vh)) {
537 CARPSTATS_INC(carps_badlen);
538 CARP_DEBUG("%s: received len %zd < sizeof(struct vrrpv3_header) "
539 "on %s\n", __func__, m->m_len - sizeof(struct ip),
540 if_name(m->m_pkthdr.rcvif));
541 m_freem(m);
542 return (IPPROTO_DONE);
543 }
544
545 if (m->m_len < iplen + sizeof(*vh)) {
546 if ((m = m_pullup(m, iplen + sizeof(*vh))) == NULL) {
547 CARPSTATS_INC(carps_hdrops);
548 CARP_DEBUG("%s():%d: pullup failed\n", __func__, __LINE__);
549 return (IPPROTO_DONE);
550 }
551 }
552 ip = mtod(m, struct ip *);
553 totlen = ntohs(ip->ip_len);
554 vh = (struct vrrpv3_header *)((char *)ip + iplen);
555
556 switch (vh->vrrp_version) {
557 case CARP_VERSION_CARP:
558 minlen = sizeof(struct carp_header);
559 break;
560 case CARP_VERSION_VRRPv3:
561 minlen = sizeof(struct vrrpv3_header);
562 break;
563 default:
564 CARPSTATS_INC(carps_badver);
565 CARP_DEBUG("%s: unsupported version %d on %s\n", __func__,
566 vh->vrrp_version, if_name(m->m_pkthdr.rcvif));
567 m_freem(m);
568 return (IPPROTO_DONE);
569 }
570
571 /* And now check the length again but with the real minimal length. */
572 if (m->m_pkthdr.len < iplen + minlen) {
573 CARPSTATS_INC(carps_badlen);
574 CARP_DEBUG("%s: received len %zd < %d "
575 "on %s\n", __func__, m->m_len - sizeof(struct ip),
576 iplen + minlen,
577 if_name(m->m_pkthdr.rcvif));
578 m_freem(m);
579 return (IPPROTO_DONE);
580 }
581
582 if (m->m_len < iplen + minlen) {
583 if ((m = m_pullup(m, iplen + minlen)) == NULL) {
584 CARPSTATS_INC(carps_hdrops);
585 CARP_DEBUG("%s():%d: pullup failed\n", __func__, __LINE__);
586 return (IPPROTO_DONE);
587 }
588 ip = mtod(m, struct ip *);
589 vh = (struct vrrpv3_header *)((char *)ip + iplen);
590 }
591
592 switch (vh->vrrp_version) {
593 case CARP_VERSION_CARP: {
594 struct carp_header *ch;
595
596 /* verify the CARP checksum */
597 if (in_cksum_skip(m, totlen, iplen)) {
598 CARPSTATS_INC(carps_badsum);
599 CARP_DEBUG("%s: checksum failed on %s\n", __func__,
600 if_name(m->m_pkthdr.rcvif));
601 m_freem(m);
602 break;
603 }
604 ch = (struct carp_header *)((char *)ip + iplen);
605 carp_input_c(m, ch, AF_INET, ip->ip_ttl);
606 break;
607 }
608 case CARP_VERSION_VRRPv3: {
609 uint16_t phdrcksum;
610
611 phdrcksum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr,
612 htonl((u_short)(totlen - iplen) + ip->ip_p));
613 vrrp_input_c(m, iplen, AF_INET, ip->ip_ttl, totlen - iplen,
614 phdrcksum);
615 break;
616 }
617 default:
618 KASSERT(false, ("Unsupported version %d", vh->vrrp_version));
619 }
620
621 return (IPPROTO_DONE);
622 }
623 #endif
624
625 #ifdef INET6
626 static int
carp6_input(struct mbuf ** mp,int * offp,int proto)627 carp6_input(struct mbuf **mp, int *offp, int proto)
628 {
629 struct mbuf *m = *mp;
630 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
631 struct vrrpv3_header *vh;
632 u_int len, minlen;
633
634 CARPSTATS_INC(carps_ipackets6);
635
636 if (!V_carp_allow) {
637 m_freem(m);
638 return (IPPROTO_DONE);
639 }
640
641 /* check if received on a valid carp interface */
642 if (m->m_pkthdr.rcvif->if_carp == NULL) {
643 CARPSTATS_INC(carps_badif);
644 CARP_DEBUG("%s: packet received on non-carp interface: %s\n",
645 __func__, if_name(m->m_pkthdr.rcvif));
646 m_freem(m);
647 return (IPPROTO_DONE);
648 }
649
650 if (m->m_len < *offp + sizeof(*vh)) {
651 len = m->m_len;
652 m = m_pullup(m, *offp + sizeof(*vh));
653 if (m == NULL) {
654 CARPSTATS_INC(carps_badlen);
655 CARP_DEBUG("%s: packet size %u too small\n", __func__, len);
656 return (IPPROTO_DONE);
657 }
658 ip6 = mtod(m, struct ip6_hdr *);
659 }
660 vh = (struct vrrpv3_header *)(mtod(m, char *) + *offp);
661
662 switch (vh->vrrp_version) {
663 case CARP_VERSION_CARP:
664 minlen = sizeof(struct carp_header);
665 break;
666 case CARP_VERSION_VRRPv3:
667 minlen = sizeof(struct vrrpv3_header);
668 break;
669 default:
670 CARPSTATS_INC(carps_badver);
671 CARP_DEBUG("%s: unsupported version %d on %s\n", __func__,
672 vh->vrrp_version, if_name(m->m_pkthdr.rcvif));
673 m_freem(m);
674 return (IPPROTO_DONE);
675 }
676
677 /* And now check the length again but with the real minimal length. */
678 if (m->m_pkthdr.len < sizeof(*ip6) + minlen) {
679 CARPSTATS_INC(carps_badlen);
680 CARP_DEBUG("%s: received len %zd < %zd "
681 "on %s\n", __func__, m->m_len - sizeof(struct ip),
682 sizeof(*ip6) + minlen,
683 if_name(m->m_pkthdr.rcvif));
684 m_freem(m);
685 return (IPPROTO_DONE);
686 }
687
688 if (m->m_len < sizeof(*ip6) + minlen) {
689 if ((m = m_pullup(m, sizeof(*ip6) + minlen)) == NULL) {
690 CARPSTATS_INC(carps_hdrops);
691 CARP_DEBUG("%s():%d: pullup failed\n", __func__, __LINE__);
692 return (IPPROTO_DONE);
693 }
694 ip6 = mtod(m, struct ip6_hdr *);
695 vh = (struct vrrpv3_header *)mtodo(m, sizeof(*ip6));
696 }
697
698 switch (vh->vrrp_version) {
699 case CARP_VERSION_CARP: {
700 struct carp_header *ch;
701
702 /* verify the CARP checksum */
703 if (in_cksum_skip(m, *offp + sizeof(struct carp_header),
704 *offp)) {
705 CARPSTATS_INC(carps_badsum);
706 CARP_DEBUG("%s: checksum failed, on %s\n", __func__,
707 if_name(m->m_pkthdr.rcvif));
708 m_freem(m);
709 break;
710 }
711 ch = (struct carp_header *)((char *)ip6 + sizeof(*ip6));
712 carp_input_c(m, ch, AF_INET6, ip6->ip6_hlim);
713 break;
714 }
715 case CARP_VERSION_VRRPv3: {
716 uint16_t phdrcksum;
717
718 phdrcksum = in6_cksum_pseudo(ip6, ntohs(ip6->ip6_plen),
719 ip6->ip6_nxt, 0);
720 vrrp_input_c(m, sizeof(*ip6), AF_INET6, ip6->ip6_hlim,
721 ntohs(ip6->ip6_plen), phdrcksum);
722 break;
723 }
724 default:
725 KASSERT(false, ("Unsupported version %d", vh->vrrp_version));
726 }
727 return (IPPROTO_DONE);
728 }
729 #endif /* INET6 */
730
731 /*
732 * This routine should not be necessary at all, but some switches
733 * (VMWare ESX vswitches) can echo our own packets back at us,
734 * and we must ignore them or they will cause us to drop out of
735 * MASTER mode.
736 *
737 * We cannot catch all cases of network loops. Instead, what we
738 * do here is catch any packet that arrives with a carp header
739 * with a VHID of 0, that comes from an address that is our own.
740 * These packets are by definition "from us" (even if they are from
741 * a misconfigured host that is pretending to be us).
742 *
743 * The VHID test is outside this mini-function.
744 */
745 static int
carp_source_is_self(const struct mbuf * m,struct ifaddr * ifa,sa_family_t af)746 carp_source_is_self(const struct mbuf *m, struct ifaddr *ifa, sa_family_t af)
747 {
748 #ifdef INET
749 struct ip *ip4;
750 struct in_addr in4;
751 #endif
752 #ifdef INET6
753 struct ip6_hdr *ip6;
754 struct in6_addr in6;
755 #endif
756
757 switch (af) {
758 #ifdef INET
759 case AF_INET:
760 ip4 = mtod(m, struct ip *);
761 in4 = ifatoia(ifa)->ia_addr.sin_addr;
762 return (in4.s_addr == ip4->ip_src.s_addr);
763 #endif
764 #ifdef INET6
765 case AF_INET6:
766 ip6 = mtod(m, struct ip6_hdr *);
767 in6 = ifatoia6(ifa)->ia_addr.sin6_addr;
768 return (memcmp(&in6, &ip6->ip6_src, sizeof(in6)) == 0);
769 #endif
770 default:
771 break;
772 }
773 return (0);
774 }
775
776 static struct ifaddr *
carp_find_ifa(const struct mbuf * m,sa_family_t af,uint8_t vhid)777 carp_find_ifa(const struct mbuf *m, sa_family_t af, uint8_t vhid)
778 {
779 struct ifnet *ifp = m->m_pkthdr.rcvif;
780 struct ifaddr *ifa, *match;
781 int error;
782
783 NET_EPOCH_ASSERT();
784
785 /*
786 * Verify that the VHID is valid on the receiving interface.
787 *
788 * There should be just one match. If there are none
789 * the VHID is not valid and we drop the packet. If
790 * there are multiple VHID matches, take just the first
791 * one, for compatibility with previous code. While we're
792 * scanning, check for obvious loops in the network topology
793 * (these should never happen, and as noted above, we may
794 * miss real loops; this is just a double-check).
795 */
796 error = 0;
797 match = NULL;
798 IFNET_FOREACH_IFA(ifp, ifa) {
799 if (match == NULL && ifa->ifa_carp != NULL &&
800 ifa->ifa_addr->sa_family == af &&
801 ifa->ifa_carp->sc_vhid == vhid)
802 match = ifa;
803 if (vhid == 0 && carp_source_is_self(m, ifa, af))
804 error = ELOOP;
805 }
806 ifa = error ? NULL : match;
807 if (ifa != NULL)
808 ifa_ref(ifa);
809
810 if (ifa == NULL) {
811 if (error == ELOOP) {
812 CARP_DEBUG("dropping looped packet on interface %s\n",
813 if_name(ifp));
814 CARPSTATS_INC(carps_badif); /* ??? */
815 } else {
816 CARPSTATS_INC(carps_badvhid);
817 }
818 }
819
820 return (ifa);
821 }
822
823 static void
carp_input_c(struct mbuf * m,struct carp_header * ch,sa_family_t af,int ttl)824 carp_input_c(struct mbuf *m, struct carp_header *ch, sa_family_t af, int ttl)
825 {
826 struct ifnet *ifp = m->m_pkthdr.rcvif;
827 struct ifaddr *ifa;
828 struct carp_softc *sc;
829 uint64_t tmp_counter;
830 struct timeval sc_tv, ch_tv;
831 bool multicast = false;
832
833 NET_EPOCH_ASSERT();
834 MPASS(ch->carp_version == CARP_VERSION_CARP);
835
836 ifa = carp_find_ifa(m, af, ch->carp_vhid);
837 if (ifa == NULL) {
838 m_freem(m);
839 return;
840 }
841
842 sc = ifa->ifa_carp;
843 CARP_LOCK(sc);
844
845 /* verify the CARP version. */
846 if (sc->sc_version != CARP_VERSION_CARP) {
847 CARP_UNLOCK(sc);
848
849 CARPSTATS_INC(carps_badver);
850 CARP_DEBUG("%s: invalid version %d\n", if_name(ifp),
851 ch->carp_version);
852 ifa_free(ifa);
853 m_freem(m);
854 return;
855 }
856
857 if (ifa->ifa_addr->sa_family == AF_INET) {
858 multicast = IN_MULTICAST(sc->sc_carpaddr.s_addr);
859 } else {
860 multicast = IN6_IS_ADDR_MULTICAST(&sc->sc_carpaddr6);
861 }
862 ifa_free(ifa);
863
864 /* verify that the IP TTL is 255, but only if we're not in unicast mode. */
865 if (multicast && ttl != CARP_DFLTTL) {
866 CARPSTATS_INC(carps_badttl);
867 CARP_DEBUG("%s: received ttl %d != 255 on %s\n", __func__,
868 ttl, if_name(m->m_pkthdr.rcvif));
869 goto out;
870 }
871
872 if (carp_hmac_verify(sc, ch->carp_counter, ch->carp_md)) {
873 CARPSTATS_INC(carps_badauth);
874 CARP_DEBUG("%s: incorrect hash for VHID %u@%s\n", __func__,
875 sc->sc_vhid, if_name(ifp));
876 goto out;
877 }
878
879 tmp_counter = ntohl(ch->carp_counter[0]);
880 tmp_counter = tmp_counter<<32;
881 tmp_counter += ntohl(ch->carp_counter[1]);
882
883 /* XXX Replay protection goes here */
884
885 sc->sc_init_counter = false;
886 sc->sc_counter = tmp_counter;
887
888 sc_tv.tv_sec = sc->sc_advbase;
889 sc_tv.tv_usec = DEMOTE_ADVSKEW(sc) * 1000000 / 256;
890 ch_tv.tv_sec = ch->carp_advbase;
891 ch_tv.tv_usec = ch->carp_advskew * 1000000 / 256;
892
893 switch (sc->sc_state) {
894 case INIT:
895 break;
896 case MASTER:
897 /*
898 * If we receive an advertisement from a master who's going to
899 * be more frequent than us, go into BACKUP state.
900 */
901 if (timevalcmp(&sc_tv, &ch_tv, >) ||
902 timevalcmp(&sc_tv, &ch_tv, ==)) {
903 callout_stop(&sc->sc_ad_tmo);
904 carp_set_state(sc, BACKUP,
905 "more frequent advertisement received");
906 carp_setrun(sc, 0);
907 carp_delroute(sc);
908 }
909 break;
910 case BACKUP:
911 /*
912 * If we're pre-empting masters who advertise slower than us,
913 * and this one claims to be slower, treat him as down.
914 */
915 if (V_carp_preempt && timevalcmp(&sc_tv, &ch_tv, <)) {
916 carp_master_down_locked(sc,
917 "preempting a slower master");
918 break;
919 }
920
921 /*
922 * If the master is going to advertise at such a low frequency
923 * that he's guaranteed to time out, we'd might as well just
924 * treat him as timed out now.
925 */
926 sc_tv.tv_sec = sc->sc_advbase * 3;
927 if (timevalcmp(&sc_tv, &ch_tv, <)) {
928 carp_master_down_locked(sc, "master will time out");
929 break;
930 }
931
932 /*
933 * Otherwise, we reset the counter and wait for the next
934 * advertisement.
935 */
936 carp_setrun(sc, af);
937 break;
938 }
939
940 out:
941 CARP_UNLOCK(sc);
942 m_freem(m);
943 }
944
945 static void
vrrp_input_c(struct mbuf * m,int off,sa_family_t af,int ttl,int len,uint16_t phdrcksum)946 vrrp_input_c(struct mbuf *m, int off, sa_family_t af, int ttl,
947 int len, uint16_t phdrcksum)
948 {
949 struct vrrpv3_header *vh = mtodo(m, off);
950 struct ifnet *ifp = m->m_pkthdr.rcvif;
951 struct ifaddr *ifa;
952 struct carp_softc *sc;
953
954 NET_EPOCH_ASSERT();
955 MPASS(vh->vrrp_version == CARP_VERSION_VRRPv3);
956
957 ifa = carp_find_ifa(m, af, vh->vrrp_vrtid);
958 if (ifa == NULL) {
959 m_freem(m);
960 return;
961 }
962
963 sc = ifa->ifa_carp;
964 CARP_LOCK(sc);
965
966 ifa_free(ifa);
967
968 /* verify the CARP version. */
969 if (sc->sc_version != CARP_VERSION_VRRPv3) {
970 CARP_UNLOCK(sc);
971
972 CARPSTATS_INC(carps_badver);
973 CARP_DEBUG("%s: invalid version %d\n", if_name(ifp),
974 vh->vrrp_version);
975 m_freem(m);
976 return;
977 }
978
979 /* verify that the IP TTL is 255. */
980 if (ttl != CARP_DFLTTL) {
981 CARPSTATS_INC(carps_badttl);
982 CARP_DEBUG("%s: received ttl %d != 255 on %s\n", __func__,
983 ttl, if_name(m->m_pkthdr.rcvif));
984 goto out;
985 }
986
987 if (vrrp_checksum_verify(m, off, len, phdrcksum)) {
988 CARPSTATS_INC(carps_badsum);
989 CARP_DEBUG("%s: incorrect checksum for VRID %u@%s\n", __func__,
990 sc->sc_vhid, if_name(ifp));
991 goto out;
992 }
993
994 /* RFC9568, 7.1 Receiving VRRP packets. */
995 if (sc->sc_vrrp_prio == 255) {
996 CARP_DEBUG("%s: our priority is 255. Ignore peer announcement.\n",
997 __func__);
998 goto out;
999 }
1000
1001 /* XXX TODO Check IP address payload. */
1002
1003 sc->sc_vrrp_master_inter = ntohs(vh->vrrp_max_adver_int);
1004
1005 switch (sc->sc_state) {
1006 case INIT:
1007 break;
1008 case MASTER:
1009 /*
1010 * If we receive an advertisement from a master who's going to
1011 * be more frequent than us, go into BACKUP state.
1012 * Same if the peer has a higher priority than us.
1013 */
1014 if (ntohs(vh->vrrp_max_adver_int) < sc->sc_vrrp_adv_inter ||
1015 vh->vrrp_priority > sc->sc_vrrp_prio) {
1016 callout_stop(&sc->sc_ad_tmo);
1017 carp_set_state(sc, BACKUP,
1018 "more frequent advertisement received");
1019 carp_setrun(sc, 0);
1020 carp_delroute(sc);
1021 }
1022 break;
1023 case BACKUP:
1024 /*
1025 * If we're pre-empting masters who advertise slower than us,
1026 * and this one claims to be slower, treat him as down.
1027 */
1028 if (V_carp_preempt && (ntohs(vh->vrrp_max_adver_int) > sc->sc_vrrp_adv_inter
1029 || vh->vrrp_priority < sc->sc_vrrp_prio)) {
1030 carp_master_down_locked(sc,
1031 "preempting a slower master");
1032 break;
1033 }
1034
1035 /*
1036 * Otherwise, we reset the counter and wait for the next
1037 * advertisement.
1038 */
1039 carp_setrun(sc, af);
1040 break;
1041 }
1042
1043 out:
1044 CARP_UNLOCK(sc);
1045 m_freem(m);
1046 }
1047
1048 static int
carp_tag(struct carp_softc * sc,struct mbuf * m)1049 carp_tag(struct carp_softc *sc, struct mbuf *m)
1050 {
1051 struct m_tag *mtag;
1052
1053 /* Tag packet for carp_output */
1054 if ((mtag = m_tag_get(PACKET_TAG_CARP, sizeof(sc->sc_vhid),
1055 M_NOWAIT)) == NULL) {
1056 m_freem(m);
1057 CARPSTATS_INC(carps_onomem);
1058 return (ENOMEM);
1059 }
1060 bcopy(&sc->sc_vhid, mtag + 1, sizeof(sc->sc_vhid));
1061 m_tag_prepend(m, mtag);
1062
1063 return (0);
1064 }
1065
1066 static void
carp_prepare_ad(struct mbuf * m,struct carp_softc * sc,struct carp_header * ch)1067 carp_prepare_ad(struct mbuf *m, struct carp_softc *sc, struct carp_header *ch)
1068 {
1069
1070 MPASS(sc->sc_version == CARP_VERSION_CARP);
1071
1072 if (sc->sc_init_counter) {
1073 /* this could also be seconds since unix epoch */
1074 sc->sc_counter = arc4random();
1075 sc->sc_counter = sc->sc_counter << 32;
1076 sc->sc_counter += arc4random();
1077 } else
1078 sc->sc_counter++;
1079
1080 ch->carp_counter[0] = htonl((sc->sc_counter>>32)&0xffffffff);
1081 ch->carp_counter[1] = htonl(sc->sc_counter&0xffffffff);
1082
1083 carp_hmac_generate(sc, ch->carp_counter, ch->carp_md);
1084 }
1085
1086 static inline void
send_ad_locked(struct carp_softc * sc)1087 send_ad_locked(struct carp_softc *sc)
1088 {
1089 switch (sc->sc_version) {
1090 case CARP_VERSION_CARP:
1091 carp_send_ad_locked(sc);
1092 break;
1093 case CARP_VERSION_VRRPv3:
1094 vrrp_send_ad_locked(sc);
1095 break;
1096 }
1097 }
1098
1099 /*
1100 * To avoid LORs and possible recursions this function shouldn't
1101 * be called directly, but scheduled via taskqueue.
1102 */
1103 static void
carp_send_ad_all(void * ctx __unused,int pending __unused)1104 carp_send_ad_all(void *ctx __unused, int pending __unused)
1105 {
1106 struct carp_softc *sc;
1107 struct epoch_tracker et;
1108
1109 NET_EPOCH_ENTER(et);
1110 mtx_lock(&carp_mtx);
1111 LIST_FOREACH(sc, &carp_list, sc_next)
1112 if (sc->sc_state == MASTER) {
1113 CARP_LOCK(sc);
1114 CURVNET_SET(sc->sc_carpdev->if_vnet);
1115 send_ad_locked(sc);
1116 CURVNET_RESTORE();
1117 CARP_UNLOCK(sc);
1118 }
1119 mtx_unlock(&carp_mtx);
1120 NET_EPOCH_EXIT(et);
1121 }
1122
1123 /* Send a periodic advertisement, executed in callout context. */
1124 static void
carp_callout(void * v)1125 carp_callout(void *v)
1126 {
1127 struct carp_softc *sc = v;
1128 struct epoch_tracker et;
1129
1130 NET_EPOCH_ENTER(et);
1131 CARP_LOCK_ASSERT(sc);
1132 CURVNET_SET(sc->sc_carpdev->if_vnet);
1133 send_ad_locked(sc);
1134 CURVNET_RESTORE();
1135 CARP_UNLOCK(sc);
1136 NET_EPOCH_EXIT(et);
1137 }
1138
1139 static void
carp_send_ad_error(struct carp_softc * sc,int error)1140 carp_send_ad_error(struct carp_softc *sc, int error)
1141 {
1142
1143 /*
1144 * We track errors and successful sends with this logic:
1145 * - Any error resets success counter to 0.
1146 * - MAX_ERRORS triggers demotion.
1147 * - MIN_SUCCESS successes resets error counter to 0.
1148 * - MIN_SUCCESS reverts demotion, if it was triggered before.
1149 */
1150 if (error) {
1151 if (sc->sc_sendad_errors < INT_MAX)
1152 sc->sc_sendad_errors++;
1153 if (sc->sc_sendad_errors == CARP_SENDAD_MAX_ERRORS) {
1154 static const char fmt[] = "send error %d on %s";
1155 char msg[sizeof(fmt) + IFNAMSIZ];
1156
1157 sprintf(msg, fmt, error, if_name(sc->sc_carpdev));
1158 carp_demote_adj(V_carp_senderr_adj, msg);
1159 }
1160 sc->sc_sendad_success = 0;
1161 } else if (sc->sc_sendad_errors > 0) {
1162 if (++sc->sc_sendad_success >= CARP_SENDAD_MIN_SUCCESS) {
1163 if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS) {
1164 static const char fmt[] = "send ok on %s";
1165 char msg[sizeof(fmt) + IFNAMSIZ];
1166
1167 sprintf(msg, fmt, if_name(sc->sc_carpdev));
1168 carp_demote_adj(-V_carp_senderr_adj, msg);
1169 }
1170 sc->sc_sendad_errors = 0;
1171 }
1172 }
1173 }
1174
1175 /*
1176 * Pick the best ifaddr on the given ifp for sending CARP
1177 * advertisements.
1178 *
1179 * "Best" here is defined by ifa_preferred(). This function is much
1180 * much like ifaof_ifpforaddr() except that we just use ifa_preferred().
1181 *
1182 * (This could be simplified to return the actual address, except that
1183 * it has a different format in AF_INET and AF_INET6.)
1184 */
1185 static struct ifaddr *
carp_best_ifa(int af,struct ifnet * ifp)1186 carp_best_ifa(int af, struct ifnet *ifp)
1187 {
1188 struct ifaddr *ifa, *best;
1189
1190 NET_EPOCH_ASSERT();
1191
1192 if (af >= AF_MAX)
1193 return (NULL);
1194 best = NULL;
1195 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1196 if (ifa->ifa_addr->sa_family == af &&
1197 (best == NULL || ifa_preferred(best, ifa)))
1198 best = ifa;
1199 }
1200 if (best != NULL)
1201 ifa_ref(best);
1202 return (best);
1203 }
1204
1205 static void
carp_send_ad_locked(struct carp_softc * sc)1206 carp_send_ad_locked(struct carp_softc *sc)
1207 {
1208 struct carp_header ch;
1209 struct timeval tv;
1210 struct ifaddr *ifa;
1211 struct carp_header *ch_ptr;
1212 struct mbuf *m;
1213 int len, advskew;
1214
1215 NET_EPOCH_ASSERT();
1216 CARP_LOCK_ASSERT(sc);
1217 MPASS(sc->sc_version == CARP_VERSION_CARP);
1218
1219 advskew = DEMOTE_ADVSKEW(sc);
1220 tv.tv_sec = sc->sc_advbase;
1221 tv.tv_usec = advskew * 1000000 / 256;
1222
1223 ch.carp_version = CARP_VERSION_CARP;
1224 ch.carp_type = CARP_ADVERTISEMENT;
1225 ch.carp_vhid = sc->sc_vhid;
1226 ch.carp_advbase = sc->sc_advbase;
1227 ch.carp_advskew = advskew;
1228 ch.carp_authlen = 7; /* XXX DEFINE */
1229 ch.carp_pad1 = 0; /* must be zero */
1230 ch.carp_cksum = 0;
1231
1232 /* XXXGL: OpenBSD picks first ifaddr with needed family. */
1233
1234 #ifdef INET
1235 if (sc->sc_naddrs) {
1236 struct ip *ip;
1237
1238 m = m_gethdr(M_NOWAIT, MT_DATA);
1239 if (m == NULL) {
1240 CARPSTATS_INC(carps_onomem);
1241 goto resched;
1242 }
1243 len = sizeof(*ip) + sizeof(ch);
1244 m->m_pkthdr.len = len;
1245 m->m_pkthdr.rcvif = NULL;
1246 m->m_len = len;
1247 M_ALIGN(m, m->m_len);
1248 if (IN_MULTICAST(sc->sc_carpaddr.s_addr))
1249 m->m_flags |= M_MCAST;
1250 ip = mtod(m, struct ip *);
1251 ip->ip_v = IPVERSION;
1252 ip->ip_hl = sizeof(*ip) >> 2;
1253 ip->ip_tos = V_carp_dscp << IPTOS_DSCP_OFFSET;
1254 ip->ip_len = htons(len);
1255 ip->ip_off = htons(IP_DF);
1256 ip->ip_ttl = CARP_DFLTTL;
1257 ip->ip_p = IPPROTO_CARP;
1258 ip->ip_sum = 0;
1259 ip_fillid(ip);
1260
1261 ifa = carp_best_ifa(AF_INET, sc->sc_carpdev);
1262 if (ifa != NULL) {
1263 ip->ip_src.s_addr =
1264 ifatoia(ifa)->ia_addr.sin_addr.s_addr;
1265 ifa_free(ifa);
1266 } else
1267 ip->ip_src.s_addr = 0;
1268 ip->ip_dst = sc->sc_carpaddr;
1269
1270 ch_ptr = (struct carp_header *)(&ip[1]);
1271 bcopy(&ch, ch_ptr, sizeof(ch));
1272 carp_prepare_ad(m, sc, ch_ptr);
1273 if (IN_MULTICAST(ntohl(sc->sc_carpaddr.s_addr)) &&
1274 carp_tag(sc, m) != 0)
1275 goto resched;
1276
1277 m->m_data += sizeof(*ip);
1278 ch_ptr->carp_cksum = in_cksum(m, len - sizeof(*ip));
1279 m->m_data -= sizeof(*ip);
1280
1281 CARPSTATS_INC(carps_opackets);
1282
1283 carp_send_ad_error(sc, ip_output(m, NULL, NULL, IP_RAWOUTPUT,
1284 &sc->sc_carpdev->if_carp->cif_imo, NULL));
1285 }
1286 #endif /* INET */
1287 #ifdef INET6
1288 if (sc->sc_naddrs6) {
1289 struct ip6_hdr *ip6;
1290
1291 m = m_gethdr(M_NOWAIT, MT_DATA);
1292 if (m == NULL) {
1293 CARPSTATS_INC(carps_onomem);
1294 goto resched;
1295 }
1296 len = sizeof(*ip6) + sizeof(ch);
1297 m->m_pkthdr.len = len;
1298 m->m_pkthdr.rcvif = NULL;
1299 m->m_len = len;
1300 M_ALIGN(m, m->m_len);
1301 ip6 = mtod(m, struct ip6_hdr *);
1302 bzero(ip6, sizeof(*ip6));
1303 ip6->ip6_vfc |= IPV6_VERSION;
1304 /* Traffic class isn't defined in ip6 struct instead
1305 * it gets offset into flowid field */
1306 ip6->ip6_flow |= htonl(V_carp_dscp << (IPV6_FLOWLABEL_LEN +
1307 IPTOS_DSCP_OFFSET));
1308 ip6->ip6_hlim = CARP_DFLTTL;
1309 ip6->ip6_nxt = IPPROTO_CARP;
1310
1311 /* set the source address */
1312 ifa = carp_best_ifa(AF_INET6, sc->sc_carpdev);
1313 if (ifa != NULL) {
1314 bcopy(IFA_IN6(ifa), &ip6->ip6_src,
1315 sizeof(struct in6_addr));
1316 ifa_free(ifa);
1317 } else
1318 /* This should never happen with IPv6. */
1319 bzero(&ip6->ip6_src, sizeof(struct in6_addr));
1320
1321 /* Set the multicast destination. */
1322 memcpy(&ip6->ip6_dst, &sc->sc_carpaddr6, sizeof(ip6->ip6_dst));
1323 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) ||
1324 IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_dst)) {
1325 if (in6_setscope(&ip6->ip6_dst, sc->sc_carpdev, NULL) != 0) {
1326 m_freem(m);
1327 CARP_DEBUG("%s: in6_setscope failed\n", __func__);
1328 goto resched;
1329 }
1330 }
1331
1332 ch_ptr = (struct carp_header *)(&ip6[1]);
1333 bcopy(&ch, ch_ptr, sizeof(ch));
1334 carp_prepare_ad(m, sc, ch_ptr);
1335 if (IN6_IS_ADDR_MULTICAST(&sc->sc_carpaddr6) &&
1336 carp_tag(sc, m) != 0)
1337 goto resched;
1338
1339 m->m_data += sizeof(*ip6);
1340 ch_ptr->carp_cksum = in_cksum(m, len - sizeof(*ip6));
1341 m->m_data -= sizeof(*ip6);
1342
1343 CARPSTATS_INC(carps_opackets6);
1344
1345 carp_send_ad_error(sc, ip6_output(m, NULL, NULL, 0,
1346 &sc->sc_carpdev->if_carp->cif_im6o, NULL, NULL));
1347 }
1348 #endif /* INET6 */
1349
1350 resched:
1351 callout_reset(&sc->sc_ad_tmo, tvtohz(&tv), carp_callout, sc);
1352 }
1353
1354 static void
vrrp_send_ad_locked(struct carp_softc * sc)1355 vrrp_send_ad_locked(struct carp_softc *sc)
1356 {
1357 struct vrrpv3_header *vh_ptr;
1358 struct ifaddr *ifa;
1359 struct mbuf *m;
1360 int len;
1361 struct vrrpv3_header vh = {
1362 .vrrp_version = CARP_VERSION_VRRPv3,
1363 .vrrp_type = VRRP_TYPE_ADVERTISEMENT,
1364 .vrrp_vrtid = sc->sc_vhid,
1365 .vrrp_priority = sc->sc_vrrp_prio,
1366 .vrrp_count_addr = 0,
1367 .vrrp_max_adver_int = htons(sc->sc_vrrp_adv_inter),
1368 .vrrp_checksum = 0,
1369 };
1370
1371 NET_EPOCH_ASSERT();
1372 CARP_LOCK_ASSERT(sc);
1373 MPASS(sc->sc_version == CARP_VERSION_VRRPv3);
1374
1375 #ifdef INET
1376 if (sc->sc_naddrs) {
1377 struct ip *ip;
1378
1379 m = m_gethdr(M_NOWAIT, MT_DATA);
1380 if (m == NULL) {
1381 CARPSTATS_INC(carps_onomem);
1382 goto resched;
1383 }
1384 len = sizeof(*ip) + sizeof(vh);
1385 m->m_pkthdr.len = len;
1386 m->m_pkthdr.rcvif = NULL;
1387 m->m_len = len;
1388 M_ALIGN(m, m->m_len);
1389 m->m_flags |= M_MCAST;
1390 ip = mtod(m, struct ip *);
1391 ip->ip_v = IPVERSION;
1392 ip->ip_hl = sizeof(*ip) >> 2;
1393 ip->ip_tos = V_carp_dscp << IPTOS_DSCP_OFFSET;
1394 ip->ip_off = htons(IP_DF);
1395 ip->ip_ttl = CARP_DFLTTL;
1396 ip->ip_p = IPPROTO_CARP;
1397 ip->ip_sum = 0;
1398 ip_fillid(ip);
1399
1400 ifa = carp_best_ifa(AF_INET, sc->sc_carpdev);
1401 if (ifa != NULL) {
1402 ip->ip_src.s_addr =
1403 ifatoia(ifa)->ia_addr.sin_addr.s_addr;
1404 ifa_free(ifa);
1405 } else
1406 ip->ip_src.s_addr = 0;
1407 ip->ip_dst.s_addr = htonl(INADDR_CARP_GROUP);
1408
1409 /* Include the IP addresses in the announcement. */
1410 for (int i = 0; i < (sc->sc_naddrs + sc->sc_naddrs6); i++) {
1411 struct sockaddr_in *in;
1412
1413 MPASS(sc->sc_ifas[i] != NULL);
1414 if (sc->sc_ifas[i]->ifa_addr->sa_family != AF_INET)
1415 continue;
1416
1417 in = (struct sockaddr_in *)sc->sc_ifas[i]->ifa_addr;
1418
1419 if (m_append(m, sizeof(in->sin_addr),
1420 (caddr_t)&in->sin_addr) != 1) {
1421 m_freem(m);
1422 goto resched;
1423 }
1424
1425 vh.vrrp_count_addr++;
1426 len += sizeof(in->sin_addr);
1427 }
1428 ip->ip_len = htons(len);
1429
1430 vh_ptr = (struct vrrpv3_header *)mtodo(m, sizeof(*ip));
1431 bcopy(&vh, vh_ptr, sizeof(vh));
1432
1433 vh_ptr->vrrp_checksum = in_pseudo(ip->ip_src.s_addr,
1434 ip->ip_dst.s_addr,
1435 htonl((uint16_t)(len - sizeof(*ip)) + ip->ip_p));
1436 vh_ptr->vrrp_checksum = in_cksum_skip(m, len, sizeof(*ip));
1437
1438 if (carp_tag(sc, m))
1439 goto resched;
1440
1441 CARPSTATS_INC(carps_opackets);
1442
1443 carp_send_ad_error(sc, ip_output(m, NULL, NULL, IP_RAWOUTPUT,
1444 &sc->sc_carpdev->if_carp->cif_imo, NULL));
1445 }
1446 #endif
1447 #ifdef INET6
1448 if (sc->sc_naddrs6) {
1449 struct ip6_hdr *ip6;
1450
1451 m = m_gethdr(M_NOWAIT, MT_DATA);
1452 if (m == NULL) {
1453 CARPSTATS_INC(carps_onomem);
1454 goto resched;
1455 }
1456 len = sizeof(*ip6) + sizeof(vh);
1457 m->m_pkthdr.len = len;
1458 m->m_pkthdr.rcvif = NULL;
1459 m->m_len = len;
1460 M_ALIGN(m, m->m_len);
1461 m->m_flags |= M_MCAST;
1462 ip6 = mtod(m, struct ip6_hdr *);
1463 bzero(ip6, sizeof(*ip6));
1464 ip6->ip6_vfc |= IPV6_VERSION;
1465 /* Traffic class isn't defined in ip6 struct instead
1466 * it gets offset into flowid field */
1467 ip6->ip6_flow |= htonl(V_carp_dscp << (IPV6_FLOWLABEL_LEN +
1468 IPTOS_DSCP_OFFSET));
1469 ip6->ip6_hlim = CARP_DFLTTL;
1470 ip6->ip6_nxt = IPPROTO_CARP;
1471
1472 /* set the source address */
1473 ifa = carp_best_ifa(AF_INET6, sc->sc_carpdev);
1474 if (ifa != NULL) {
1475 bcopy(IFA_IN6(ifa), &ip6->ip6_src,
1476 sizeof(struct in6_addr));
1477 ifa_free(ifa);
1478 } else
1479 /* This should never happen with IPv6. */
1480 bzero(&ip6->ip6_src, sizeof(struct in6_addr));
1481
1482 /* Set the multicast destination. */
1483 bzero(&ip6->ip6_dst, sizeof(ip6->ip6_dst));
1484 ip6->ip6_dst.s6_addr16[0] = IPV6_ADDR_INT16_MLL;
1485 ip6->ip6_dst.s6_addr8[15] = 0x12;
1486
1487 /* Include the IP addresses in the announcement. */
1488 len = sizeof(vh);
1489 for (int i = 0; i < (sc->sc_naddrs + sc->sc_naddrs6); i++) {
1490 struct sockaddr_in6 *in6;
1491
1492 MPASS(sc->sc_ifas[i] != NULL);
1493 if (sc->sc_ifas[i]->ifa_addr->sa_family != AF_INET6)
1494 continue;
1495
1496 in6 = (struct sockaddr_in6 *)sc->sc_ifas[i]->ifa_addr;
1497
1498 if (m_append(m, sizeof(in6->sin6_addr),
1499 (char *)&in6->sin6_addr) != 1) {
1500 m_freem(m);
1501 goto resched;
1502 }
1503
1504 vh.vrrp_count_addr++;
1505 len += sizeof(in6->sin6_addr);
1506 }
1507 ip6->ip6_plen = htonl(len);
1508
1509 vh_ptr = (struct vrrpv3_header *)mtodo(m, sizeof(*ip6));
1510 bcopy(&vh, vh_ptr, sizeof(vh));
1511
1512 vh_ptr->vrrp_checksum = in6_cksum_pseudo(ip6, len, ip6->ip6_nxt, 0);
1513 vh_ptr->vrrp_checksum = in_cksum_skip(m, len + sizeof(*ip6), sizeof(*ip6));
1514
1515 if (in6_setscope(&ip6->ip6_dst, sc->sc_carpdev, NULL) != 0) {
1516 m_freem(m);
1517 CARP_DEBUG("%s: in6_setscope failed\n", __func__);
1518 goto resched;
1519 }
1520
1521 if (carp_tag(sc, m))
1522 goto resched;
1523 CARPSTATS_INC(carps_opackets6);
1524
1525 carp_send_ad_error(sc, ip6_output(m, NULL, NULL, 0,
1526 &sc->sc_carpdev->if_carp->cif_im6o, NULL, NULL));
1527 }
1528 #endif
1529
1530 resched:
1531 callout_reset(&sc->sc_ad_tmo, sc->sc_vrrp_adv_inter * hz / 100,
1532 carp_callout, sc);
1533 }
1534
1535 static void
carp_addroute(struct carp_softc * sc)1536 carp_addroute(struct carp_softc *sc)
1537 {
1538 struct ifaddr *ifa;
1539
1540 CARP_FOREACH_IFA(sc, ifa)
1541 carp_ifa_addroute(ifa);
1542 }
1543
1544 static void
carp_ifa_addroute(struct ifaddr * ifa)1545 carp_ifa_addroute(struct ifaddr *ifa)
1546 {
1547
1548 switch (ifa->ifa_addr->sa_family) {
1549 #ifdef INET
1550 case AF_INET:
1551 in_addprefix(ifatoia(ifa));
1552 ifa_add_loopback_route(ifa,
1553 (struct sockaddr *)&ifatoia(ifa)->ia_addr);
1554 break;
1555 #endif
1556 #ifdef INET6
1557 case AF_INET6:
1558 ifa_add_loopback_route(ifa,
1559 (struct sockaddr *)&ifatoia6(ifa)->ia_addr);
1560 nd6_add_ifa_lle(ifatoia6(ifa));
1561 break;
1562 #endif
1563 }
1564 }
1565
1566 static void
carp_delroute(struct carp_softc * sc)1567 carp_delroute(struct carp_softc *sc)
1568 {
1569 struct ifaddr *ifa;
1570
1571 CARP_FOREACH_IFA(sc, ifa)
1572 carp_ifa_delroute(ifa);
1573 }
1574
1575 static void
carp_ifa_delroute(struct ifaddr * ifa)1576 carp_ifa_delroute(struct ifaddr *ifa)
1577 {
1578
1579 switch (ifa->ifa_addr->sa_family) {
1580 #ifdef INET
1581 case AF_INET:
1582 ifa_del_loopback_route(ifa,
1583 (struct sockaddr *)&ifatoia(ifa)->ia_addr);
1584 in_scrubprefix(ifatoia(ifa), LLE_STATIC);
1585 break;
1586 #endif
1587 #ifdef INET6
1588 case AF_INET6:
1589 ifa_del_loopback_route(ifa,
1590 (struct sockaddr *)&ifatoia6(ifa)->ia_addr);
1591 nd6_rem_ifa_lle(ifatoia6(ifa), 1);
1592 break;
1593 #endif
1594 }
1595 }
1596
1597 int
carp_master(struct ifaddr * ifa)1598 carp_master(struct ifaddr *ifa)
1599 {
1600 struct carp_softc *sc = ifa->ifa_carp;
1601
1602 return (sc->sc_state == MASTER);
1603 }
1604
1605 #ifdef INET
1606 /*
1607 * Broadcast a gratuitous ARP request containing
1608 * the virtual router MAC address for each IP address
1609 * associated with the virtual router.
1610 */
1611 static void
carp_send_arp(struct carp_softc * sc)1612 carp_send_arp(struct carp_softc *sc)
1613 {
1614 struct ifaddr *ifa;
1615 struct in_addr addr;
1616
1617 NET_EPOCH_ASSERT();
1618
1619 CARP_FOREACH_IFA(sc, ifa) {
1620 if (ifa->ifa_addr->sa_family != AF_INET)
1621 continue;
1622 addr = ((struct sockaddr_in *)ifa->ifa_addr)->sin_addr;
1623 arp_announce_ifaddr(sc->sc_carpdev, addr, sc->sc_addr);
1624 }
1625 }
1626
1627 int
carp_iamatch(struct ifaddr * ifa,uint8_t ** enaddr)1628 carp_iamatch(struct ifaddr *ifa, uint8_t **enaddr)
1629 {
1630 struct carp_softc *sc = ifa->ifa_carp;
1631
1632 if (sc->sc_state == MASTER) {
1633 *enaddr = sc->sc_addr;
1634 return (1);
1635 }
1636
1637 return (0);
1638 }
1639 #endif
1640
1641 #ifdef INET6
1642 static void
carp_send_na(struct carp_softc * sc)1643 carp_send_na(struct carp_softc *sc)
1644 {
1645 static struct in6_addr mcast = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
1646 struct ifaddr *ifa;
1647 struct in6_addr *in6;
1648
1649 CARP_FOREACH_IFA(sc, ifa) {
1650 if (ifa->ifa_addr->sa_family != AF_INET6)
1651 continue;
1652
1653 in6 = IFA_IN6(ifa);
1654 nd6_na_output(sc->sc_carpdev, &mcast, in6,
1655 ND_NA_FLAG_OVERRIDE, 1, NULL);
1656 DELAY(1000); /* XXX */
1657 }
1658 }
1659
1660 /*
1661 * Returns ifa in case it's a carp address and it is MASTER, or if the address
1662 * matches and is not a carp address. Returns NULL otherwise.
1663 */
1664 struct ifaddr *
carp_iamatch6(struct ifnet * ifp,struct in6_addr * taddr)1665 carp_iamatch6(struct ifnet *ifp, struct in6_addr *taddr)
1666 {
1667 struct ifaddr *ifa;
1668
1669 NET_EPOCH_ASSERT();
1670
1671 ifa = NULL;
1672 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1673 if (ifa->ifa_addr->sa_family != AF_INET6)
1674 continue;
1675 if (!IN6_ARE_ADDR_EQUAL(taddr, IFA_IN6(ifa)))
1676 continue;
1677 if (ifa->ifa_carp && ifa->ifa_carp->sc_state != MASTER)
1678 ifa = NULL;
1679 else
1680 ifa_ref(ifa);
1681 break;
1682 }
1683
1684 return (ifa);
1685 }
1686
1687 char *
carp_macmatch6(struct ifnet * ifp,struct mbuf * m,const struct in6_addr * taddr)1688 carp_macmatch6(struct ifnet *ifp, struct mbuf *m, const struct in6_addr *taddr)
1689 {
1690 struct ifaddr *ifa;
1691
1692 NET_EPOCH_ASSERT();
1693
1694 IFNET_FOREACH_IFA(ifp, ifa)
1695 if (ifa->ifa_addr->sa_family == AF_INET6 &&
1696 IN6_ARE_ADDR_EQUAL(taddr, IFA_IN6(ifa))) {
1697 struct carp_softc *sc = ifa->ifa_carp;
1698 struct m_tag *mtag;
1699
1700 mtag = m_tag_get(PACKET_TAG_CARP,
1701 sizeof(struct carp_softc *), M_NOWAIT);
1702 if (mtag == NULL)
1703 /* Better a bit than nothing. */
1704 return (sc->sc_addr);
1705
1706 bcopy(&sc, mtag + 1, sizeof(sc));
1707 m_tag_prepend(m, mtag);
1708
1709 return (sc->sc_addr);
1710 }
1711
1712 return (NULL);
1713 }
1714 #endif /* INET6 */
1715
1716 int
carp_forus(struct ifnet * ifp,u_char * dhost)1717 carp_forus(struct ifnet *ifp, u_char *dhost)
1718 {
1719 struct carp_softc *sc;
1720 uint8_t *ena = dhost;
1721
1722 if (ena[0] || ena[1] || ena[2] != 0x5e || ena[3] || ena[4] != 1)
1723 return (0);
1724
1725 CIF_LOCK(ifp->if_carp);
1726 IFNET_FOREACH_CARP(ifp, sc) {
1727 /*
1728 * CARP_LOCK() is not here, since would protect nothing, but
1729 * cause deadlock with if_bridge, calling this under its lock.
1730 */
1731 if (sc->sc_state == MASTER && !bcmp(dhost, sc->sc_addr,
1732 ETHER_ADDR_LEN)) {
1733 CIF_UNLOCK(ifp->if_carp);
1734 return (1);
1735 }
1736 }
1737 CIF_UNLOCK(ifp->if_carp);
1738
1739 return (0);
1740 }
1741
1742 /* Master down timeout event, executed in callout context. */
1743 static void
carp_master_down(void * v)1744 carp_master_down(void *v)
1745 {
1746 struct carp_softc *sc = v;
1747 struct epoch_tracker et;
1748
1749 NET_EPOCH_ENTER(et);
1750 CARP_LOCK_ASSERT(sc);
1751
1752 CURVNET_SET(sc->sc_carpdev->if_vnet);
1753 if (sc->sc_state == BACKUP) {
1754 carp_master_down_locked(sc, "master timed out");
1755 }
1756 CURVNET_RESTORE();
1757
1758 CARP_UNLOCK(sc);
1759 NET_EPOCH_EXIT(et);
1760 }
1761
1762 static void
carp_master_down_locked(struct carp_softc * sc,const char * reason)1763 carp_master_down_locked(struct carp_softc *sc, const char *reason)
1764 {
1765
1766 NET_EPOCH_ASSERT();
1767 CARP_LOCK_ASSERT(sc);
1768
1769 switch (sc->sc_state) {
1770 case BACKUP:
1771 carp_set_state(sc, MASTER, reason);
1772 send_ad_locked(sc);
1773 #ifdef INET
1774 carp_send_arp(sc);
1775 #endif
1776 #ifdef INET6
1777 carp_send_na(sc);
1778 #endif
1779 carp_setrun(sc, 0);
1780 carp_addroute(sc);
1781 break;
1782 case INIT:
1783 case MASTER:
1784 #ifdef INVARIANTS
1785 panic("carp: VHID %u@%s: master_down event in %s state\n",
1786 sc->sc_vhid,
1787 if_name(sc->sc_carpdev),
1788 sc->sc_state ? "MASTER" : "INIT");
1789 #endif
1790 break;
1791 }
1792 }
1793
1794 /*
1795 * When in backup state, af indicates whether to reset the master down timer
1796 * for v4 or v6. If it's set to zero, reset the ones which are already pending.
1797 */
1798 static void
carp_setrun(struct carp_softc * sc,sa_family_t af)1799 carp_setrun(struct carp_softc *sc, sa_family_t af)
1800 {
1801 struct timeval tv;
1802 int timeout;
1803
1804 CARP_LOCK_ASSERT(sc);
1805
1806 if ((sc->sc_carpdev->if_flags & IFF_UP) == 0 ||
1807 sc->sc_carpdev->if_link_state != LINK_STATE_UP ||
1808 (sc->sc_naddrs == 0 && sc->sc_naddrs6 == 0) ||
1809 !V_carp_allow)
1810 return;
1811
1812 switch (sc->sc_state) {
1813 case INIT:
1814 carp_set_state(sc, BACKUP, "initialization complete");
1815 carp_setrun(sc, 0);
1816 break;
1817 case BACKUP:
1818 callout_stop(&sc->sc_ad_tmo);
1819
1820 switch (sc->sc_version) {
1821 case CARP_VERSION_CARP:
1822 tv.tv_sec = 3 * sc->sc_advbase;
1823 tv.tv_usec = sc->sc_advskew * 1000000 / 256;
1824 timeout = tvtohz(&tv);
1825 break;
1826 case CARP_VERSION_VRRPv3:
1827 /* skew time */
1828 timeout = (256 - sc->sc_vrrp_prio) *
1829 sc->sc_vrrp_master_inter / 256;
1830 timeout += (3 * sc->sc_vrrp_master_inter);
1831 timeout *= hz;
1832 timeout /= 100; /* master interval is in centiseconds */
1833 break;
1834 }
1835 switch (af) {
1836 #ifdef INET
1837 case AF_INET:
1838 callout_reset(&sc->sc_md_tmo, timeout,
1839 carp_master_down, sc);
1840 break;
1841 #endif
1842 #ifdef INET6
1843 case AF_INET6:
1844 callout_reset(&sc->sc_md6_tmo, timeout,
1845 carp_master_down, sc);
1846 break;
1847 #endif
1848 default:
1849 #ifdef INET
1850 if (sc->sc_naddrs)
1851 callout_reset(&sc->sc_md_tmo, timeout,
1852 carp_master_down, sc);
1853 #endif
1854 #ifdef INET6
1855 if (sc->sc_naddrs6)
1856 callout_reset(&sc->sc_md6_tmo, timeout,
1857 carp_master_down, sc);
1858 #endif
1859 break;
1860 }
1861 break;
1862 case MASTER:
1863 switch (sc->sc_version) {
1864 case CARP_VERSION_CARP:
1865 tv.tv_sec = sc->sc_advbase;
1866 tv.tv_usec = sc->sc_advskew * 1000000 / 256;
1867 callout_reset(&sc->sc_ad_tmo, tvtohz(&tv),
1868 carp_callout, sc);
1869 break;
1870 case CARP_VERSION_VRRPv3:
1871 callout_reset(&sc->sc_ad_tmo,
1872 sc->sc_vrrp_adv_inter * hz / 100,
1873 carp_callout, sc);
1874 break;
1875 }
1876 break;
1877 }
1878 }
1879
1880 /*
1881 * Setup multicast structures.
1882 */
1883 static int
carp_multicast_setup(struct carp_if * cif,sa_family_t sa)1884 carp_multicast_setup(struct carp_if *cif, sa_family_t sa)
1885 {
1886 struct ifnet *ifp = cif->cif_ifp;
1887 int error = 0;
1888
1889 switch (sa) {
1890 #ifdef INET
1891 case AF_INET:
1892 {
1893 struct ip_moptions *imo = &cif->cif_imo;
1894 struct in_mfilter *imf;
1895 struct in_addr addr;
1896
1897 if (ip_mfilter_first(&imo->imo_head) != NULL)
1898 return (0);
1899
1900 imf = ip_mfilter_alloc(M_WAITOK, 0, 0);
1901 ip_mfilter_init(&imo->imo_head);
1902 imo->imo_multicast_vif = -1;
1903
1904 addr.s_addr = htonl(INADDR_CARP_GROUP);
1905 if ((error = in_joingroup(ifp, &addr, NULL,
1906 &imf->imf_inm)) != 0) {
1907 ip_mfilter_free(imf);
1908 break;
1909 }
1910
1911 ip_mfilter_insert(&imo->imo_head, imf);
1912 imo->imo_multicast_ifp = ifp;
1913 imo->imo_multicast_ttl = CARP_DFLTTL;
1914 imo->imo_multicast_loop = 0;
1915 break;
1916 }
1917 #endif
1918 #ifdef INET6
1919 case AF_INET6:
1920 {
1921 struct ip6_moptions *im6o = &cif->cif_im6o;
1922 struct in6_mfilter *im6f[2];
1923 struct in6_addr in6;
1924
1925 if (ip6_mfilter_first(&im6o->im6o_head))
1926 return (0);
1927
1928 im6f[0] = ip6_mfilter_alloc(M_WAITOK, 0, 0);
1929 im6f[1] = ip6_mfilter_alloc(M_WAITOK, 0, 0);
1930
1931 ip6_mfilter_init(&im6o->im6o_head);
1932 im6o->im6o_multicast_hlim = CARP_DFLTTL;
1933 im6o->im6o_multicast_ifp = ifp;
1934
1935 /* Join IPv6 CARP multicast group. */
1936 bzero(&in6, sizeof(in6));
1937 in6.s6_addr16[0] = htons(0xff02);
1938 in6.s6_addr8[15] = 0x12;
1939 if ((error = in6_setscope(&in6, ifp, NULL)) != 0) {
1940 ip6_mfilter_free(im6f[0]);
1941 ip6_mfilter_free(im6f[1]);
1942 break;
1943 }
1944 if ((error = in6_joingroup(ifp, &in6, NULL, &im6f[0]->im6f_in6m, 0)) != 0) {
1945 ip6_mfilter_free(im6f[0]);
1946 ip6_mfilter_free(im6f[1]);
1947 break;
1948 }
1949
1950 /* Join solicited multicast address. */
1951 bzero(&in6, sizeof(in6));
1952 in6.s6_addr16[0] = htons(0xff02);
1953 in6.s6_addr32[1] = 0;
1954 in6.s6_addr32[2] = htonl(1);
1955 in6.s6_addr32[3] = 0;
1956 in6.s6_addr8[12] = 0xff;
1957
1958 if ((error = in6_setscope(&in6, ifp, NULL)) != 0) {
1959 ip6_mfilter_free(im6f[0]);
1960 ip6_mfilter_free(im6f[1]);
1961 break;
1962 }
1963
1964 if ((error = in6_joingroup(ifp, &in6, NULL, &im6f[1]->im6f_in6m, 0)) != 0) {
1965 in6_leavegroup(im6f[0]->im6f_in6m, NULL);
1966 ip6_mfilter_free(im6f[0]);
1967 ip6_mfilter_free(im6f[1]);
1968 break;
1969 }
1970 ip6_mfilter_insert(&im6o->im6o_head, im6f[0]);
1971 ip6_mfilter_insert(&im6o->im6o_head, im6f[1]);
1972 break;
1973 }
1974 #endif
1975 }
1976
1977 return (error);
1978 }
1979
1980 /*
1981 * Free multicast structures.
1982 */
1983 static void
carp_multicast_cleanup(struct carp_if * cif,sa_family_t sa)1984 carp_multicast_cleanup(struct carp_if *cif, sa_family_t sa)
1985 {
1986 #ifdef INET
1987 struct ip_moptions *imo = &cif->cif_imo;
1988 struct in_mfilter *imf;
1989 #endif
1990 #ifdef INET6
1991 struct ip6_moptions *im6o = &cif->cif_im6o;
1992 struct in6_mfilter *im6f;
1993 #endif
1994 sx_assert(&carp_sx, SA_XLOCKED);
1995
1996 switch (sa) {
1997 #ifdef INET
1998 case AF_INET:
1999 if (cif->cif_naddrs != 0)
2000 break;
2001
2002 while ((imf = ip_mfilter_first(&imo->imo_head)) != NULL) {
2003 ip_mfilter_remove(&imo->imo_head, imf);
2004 in_leavegroup(imf->imf_inm, NULL);
2005 ip_mfilter_free(imf);
2006 }
2007 break;
2008 #endif
2009 #ifdef INET6
2010 case AF_INET6:
2011 if (cif->cif_naddrs6 != 0)
2012 break;
2013
2014 while ((im6f = ip6_mfilter_first(&im6o->im6o_head)) != NULL) {
2015 ip6_mfilter_remove(&im6o->im6o_head, im6f);
2016 in6_leavegroup(im6f->im6f_in6m, NULL);
2017 ip6_mfilter_free(im6f);
2018 }
2019 break;
2020 #endif
2021 }
2022 }
2023
2024 int
carp_output(struct ifnet * ifp,struct mbuf * m,const struct sockaddr * sa)2025 carp_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *sa)
2026 {
2027 struct m_tag *mtag;
2028 int vhid;
2029
2030 if (!sa)
2031 return (0);
2032
2033 switch (sa->sa_family) {
2034 #ifdef INET
2035 case AF_INET:
2036 break;
2037 #endif
2038 #ifdef INET6
2039 case AF_INET6:
2040 break;
2041 #endif
2042 default:
2043 return (0);
2044 }
2045
2046 mtag = m_tag_find(m, PACKET_TAG_CARP, NULL);
2047 if (mtag == NULL)
2048 return (0);
2049
2050 bcopy(mtag + 1, &vhid, sizeof(vhid));
2051
2052 /* Set the source MAC address to the Virtual Router MAC Address. */
2053 switch (ifp->if_type) {
2054 case IFT_ETHER:
2055 case IFT_BRIDGE:
2056 case IFT_L2VLAN: {
2057 struct ether_header *eh;
2058
2059 eh = mtod(m, struct ether_header *);
2060 eh->ether_shost[0] = 0;
2061 eh->ether_shost[1] = 0;
2062 eh->ether_shost[2] = 0x5e;
2063 eh->ether_shost[3] = 0;
2064 eh->ether_shost[4] = 1;
2065 eh->ether_shost[5] = vhid;
2066 }
2067 break;
2068 default:
2069 printf("%s: carp is not supported for the %d interface type\n",
2070 if_name(ifp), ifp->if_type);
2071 return (EOPNOTSUPP);
2072 }
2073
2074 return (0);
2075 }
2076
2077 static struct carp_softc*
carp_alloc(struct ifnet * ifp,carp_version_t version,int vhid)2078 carp_alloc(struct ifnet *ifp, carp_version_t version, int vhid)
2079 {
2080 struct carp_softc *sc;
2081 struct carp_if *cif;
2082
2083 sx_assert(&carp_sx, SA_XLOCKED);
2084
2085 if ((cif = ifp->if_carp) == NULL)
2086 cif = carp_alloc_if(ifp);
2087
2088 sc = malloc(sizeof(*sc), M_CARP, M_WAITOK);
2089 *sc = (struct carp_softc ){
2090 .sc_vhid = vhid,
2091 .sc_version = version,
2092 .sc_state = INIT,
2093 .sc_carpdev = ifp,
2094 .sc_ifasiz = sizeof(struct ifaddr *),
2095 .sc_addr = { 0, 0, 0x5e, 0, 1, vhid },
2096 };
2097 sc->sc_ifas = malloc(sc->sc_ifasiz, M_CARP, M_WAITOK|M_ZERO);
2098
2099 switch (version) {
2100 case CARP_VERSION_CARP:
2101 sc->sc_advbase = CARP_DFLTINTV;
2102 sc->sc_init_counter = true;
2103 sc->sc_carpaddr.s_addr = htonl(INADDR_CARP_GROUP);
2104 sc->sc_carpaddr6.s6_addr16[0] = IPV6_ADDR_INT16_MLL;
2105 sc->sc_carpaddr6.s6_addr8[15] = 0x12;
2106 break;
2107 case CARP_VERSION_VRRPv3:
2108 sc->sc_vrrp_adv_inter = 100;
2109 sc->sc_vrrp_master_inter = sc->sc_vrrp_adv_inter;
2110 sc->sc_vrrp_prio = 100;
2111 break;
2112 }
2113
2114 CARP_LOCK_INIT(sc);
2115 #ifdef INET
2116 callout_init_mtx(&sc->sc_md_tmo, &sc->sc_mtx, CALLOUT_RETURNUNLOCKED);
2117 #endif
2118 #ifdef INET6
2119 callout_init_mtx(&sc->sc_md6_tmo, &sc->sc_mtx, CALLOUT_RETURNUNLOCKED);
2120 #endif
2121 callout_init_mtx(&sc->sc_ad_tmo, &sc->sc_mtx, CALLOUT_RETURNUNLOCKED);
2122
2123 CIF_LOCK(cif);
2124 TAILQ_INSERT_TAIL(&cif->cif_vrs, sc, sc_list);
2125 CIF_UNLOCK(cif);
2126
2127 mtx_lock(&carp_mtx);
2128 LIST_INSERT_HEAD(&carp_list, sc, sc_next);
2129 mtx_unlock(&carp_mtx);
2130
2131 return (sc);
2132 }
2133
2134 static void
carp_grow_ifas(struct carp_softc * sc)2135 carp_grow_ifas(struct carp_softc *sc)
2136 {
2137 struct ifaddr **new;
2138
2139 new = malloc(sc->sc_ifasiz * 2, M_CARP, M_WAITOK | M_ZERO);
2140 CARP_LOCK(sc);
2141 bcopy(sc->sc_ifas, new, sc->sc_ifasiz);
2142 free(sc->sc_ifas, M_CARP);
2143 sc->sc_ifas = new;
2144 sc->sc_ifasiz *= 2;
2145 CARP_UNLOCK(sc);
2146 }
2147
2148 static void
carp_destroy(struct carp_softc * sc)2149 carp_destroy(struct carp_softc *sc)
2150 {
2151 struct ifnet *ifp = sc->sc_carpdev;
2152 struct carp_if *cif = ifp->if_carp;
2153
2154 sx_assert(&carp_sx, SA_XLOCKED);
2155
2156 if (sc->sc_suppress)
2157 carp_demote_adj(-V_carp_ifdown_adj, "vhid removed");
2158 CARP_UNLOCK(sc);
2159
2160 CIF_LOCK(cif);
2161 TAILQ_REMOVE(&cif->cif_vrs, sc, sc_list);
2162 CIF_UNLOCK(cif);
2163
2164 mtx_lock(&carp_mtx);
2165 LIST_REMOVE(sc, sc_next);
2166 mtx_unlock(&carp_mtx);
2167
2168 callout_drain(&sc->sc_ad_tmo);
2169 #ifdef INET
2170 callout_drain(&sc->sc_md_tmo);
2171 #endif
2172 #ifdef INET6
2173 callout_drain(&sc->sc_md6_tmo);
2174 #endif
2175 CARP_LOCK_DESTROY(sc);
2176
2177 free(sc->sc_ifas, M_CARP);
2178 free(sc, M_CARP);
2179 }
2180
2181 static struct carp_if*
carp_alloc_if(struct ifnet * ifp)2182 carp_alloc_if(struct ifnet *ifp)
2183 {
2184 struct carp_if *cif;
2185 int error;
2186
2187 cif = malloc(sizeof(*cif), M_CARP, M_WAITOK|M_ZERO);
2188
2189 if ((error = ifpromisc(ifp, 1)) != 0)
2190 printf("%s: ifpromisc(%s) failed: %d\n",
2191 __func__, if_name(ifp), error);
2192 else
2193 cif->cif_flags |= CIF_PROMISC;
2194
2195 CIF_LOCK_INIT(cif);
2196 cif->cif_ifp = ifp;
2197 TAILQ_INIT(&cif->cif_vrs);
2198
2199 IF_ADDR_WLOCK(ifp);
2200 ifp->if_carp = cif;
2201 if_ref(ifp);
2202 IF_ADDR_WUNLOCK(ifp);
2203
2204 return (cif);
2205 }
2206
2207 static void
carp_free_if(struct carp_if * cif)2208 carp_free_if(struct carp_if *cif)
2209 {
2210 struct ifnet *ifp = cif->cif_ifp;
2211
2212 CIF_LOCK_ASSERT(cif);
2213 KASSERT(TAILQ_EMPTY(&cif->cif_vrs), ("%s: softc list not empty",
2214 __func__));
2215
2216 IF_ADDR_WLOCK(ifp);
2217 ifp->if_carp = NULL;
2218 IF_ADDR_WUNLOCK(ifp);
2219
2220 CIF_LOCK_DESTROY(cif);
2221
2222 if (cif->cif_flags & CIF_PROMISC)
2223 ifpromisc(ifp, 0);
2224 if_rele(ifp);
2225
2226 free(cif, M_CARP);
2227 }
2228
2229 static bool
carp_carprcp(void * arg,struct carp_softc * sc,int priv)2230 carp_carprcp(void *arg, struct carp_softc *sc, int priv)
2231 {
2232 struct carpreq *carpr = arg;
2233
2234 CARP_LOCK(sc);
2235 carpr->carpr_state = sc->sc_state;
2236 carpr->carpr_vhid = sc->sc_vhid;
2237 switch (sc->sc_version) {
2238 case CARP_VERSION_CARP:
2239 carpr->carpr_advbase = sc->sc_advbase;
2240 carpr->carpr_advskew = sc->sc_advskew;
2241 if (priv)
2242 bcopy(sc->sc_key, carpr->carpr_key,
2243 sizeof(carpr->carpr_key));
2244 else
2245 bzero(carpr->carpr_key, sizeof(carpr->carpr_key));
2246 break;
2247 case CARP_VERSION_VRRPv3:
2248 break;
2249 }
2250 CARP_UNLOCK(sc);
2251
2252 return (true);
2253 }
2254
2255 static int
carp_ioctl_set(if_t ifp,struct carpkreq * carpr)2256 carp_ioctl_set(if_t ifp, struct carpkreq *carpr)
2257 {
2258 struct epoch_tracker et;
2259 struct carp_softc *sc = NULL;
2260 int error = 0;
2261
2262 if (carpr->carpr_vhid <= 0 || carpr->carpr_vhid > CARP_MAXVHID)
2263 return (EINVAL);
2264
2265 switch (carpr->carpr_version) {
2266 case CARP_VERSION_CARP:
2267 if (carpr->carpr_advbase != 0 && (carpr->carpr_advbase > 255 ||
2268 carpr->carpr_advbase < CARP_DFLTINTV))
2269 return (EINVAL);
2270 if (carpr->carpr_advskew < 0 || carpr->carpr_advskew >= 255)
2271 return (EINVAL);
2272 break;
2273 case CARP_VERSION_VRRPv3:
2274 /* XXXGL: shouldn't we check anything? */
2275 break;
2276 default:
2277 return (EINVAL);
2278 }
2279
2280 if (ifp->if_carp) {
2281 IFNET_FOREACH_CARP(ifp, sc)
2282 if (sc->sc_vhid == carpr->carpr_vhid)
2283 break;
2284 }
2285
2286 if (sc == NULL)
2287 sc = carp_alloc(ifp, carpr->carpr_version, carpr->carpr_vhid);
2288 else if (sc->sc_version != carpr->carpr_version)
2289 return (EINVAL);
2290
2291 CARP_LOCK(sc);
2292 switch (sc->sc_version) {
2293 case CARP_VERSION_CARP:
2294 if (carpr->carpr_advbase != 0)
2295 sc->sc_advbase = carpr->carpr_advbase;
2296 sc->sc_advskew = carpr->carpr_advskew;
2297 if (carpr->carpr_addr.s_addr != INADDR_ANY)
2298 sc->sc_carpaddr = carpr->carpr_addr;
2299 if (!IN6_IS_ADDR_UNSPECIFIED(&carpr->carpr_addr6)) {
2300 memcpy(&sc->sc_carpaddr6, &carpr->carpr_addr6,
2301 sizeof(sc->sc_carpaddr6));
2302 }
2303 if (carpr->carpr_key[0] != '\0') {
2304 bcopy(carpr->carpr_key, sc->sc_key, sizeof(sc->sc_key));
2305 carp_hmac_prepare(sc);
2306 }
2307 break;
2308 case CARP_VERSION_VRRPv3:
2309 if (carpr->carpr_vrrp_priority != 0)
2310 sc->sc_vrrp_prio = carpr->carpr_vrrp_priority;
2311 if (carpr->carpr_vrrp_adv_inter)
2312 sc->sc_vrrp_adv_inter = carpr->carpr_vrrp_adv_inter;
2313 break;
2314 }
2315
2316 if (sc->sc_state != INIT &&
2317 carpr->carpr_state != sc->sc_state) {
2318 switch (carpr->carpr_state) {
2319 case BACKUP:
2320 callout_stop(&sc->sc_ad_tmo);
2321 carp_set_state(sc, BACKUP,
2322 "user requested via ifconfig");
2323 carp_setrun(sc, 0);
2324 carp_delroute(sc);
2325 break;
2326 case MASTER:
2327 NET_EPOCH_ENTER(et);
2328 carp_master_down_locked(sc,
2329 "user requested via ifconfig");
2330 NET_EPOCH_EXIT(et);
2331 break;
2332 default:
2333 break;
2334 }
2335 }
2336 CARP_UNLOCK(sc);
2337
2338 return (error);
2339 }
2340
2341 static int
carp_ioctl_get(if_t ifp,struct ucred * cred,struct carpreq * carpr,bool (* outfn)(void *,struct carp_softc *,int),void * arg)2342 carp_ioctl_get(if_t ifp, struct ucred *cred, struct carpreq *carpr,
2343 bool (*outfn)(void *, struct carp_softc *, int), void *arg)
2344 {
2345 int priveleged;
2346 struct carp_softc *sc;
2347
2348 if (carpr->carpr_vhid < 0 || carpr->carpr_vhid > CARP_MAXVHID)
2349 return (EINVAL);
2350 if (carpr->carpr_count < 1)
2351 return (EMSGSIZE);
2352 if (ifp->if_carp == NULL)
2353 return (ENOENT);
2354
2355 priveleged = (priv_check_cred(cred, PRIV_NETINET_CARP) == 0);
2356 if (carpr->carpr_vhid != 0) {
2357 IFNET_FOREACH_CARP(ifp, sc)
2358 if (sc->sc_vhid == carpr->carpr_vhid)
2359 break;
2360 if (sc == NULL)
2361 return (ENOENT);
2362
2363 if (! outfn(arg, sc, priveleged))
2364 return (ENOMEM);
2365 carpr->carpr_count = 1;
2366 } else {
2367 int count;
2368
2369 count = 0;
2370 IFNET_FOREACH_CARP(ifp, sc)
2371 count++;
2372
2373 if (count > carpr->carpr_count)
2374 return (EMSGSIZE);
2375
2376 IFNET_FOREACH_CARP(ifp, sc) {
2377 if (! outfn(arg, sc, priveleged))
2378 return (ENOMEM);
2379 carpr->carpr_count = count;
2380 }
2381 }
2382
2383 return (0);
2384 }
2385
2386 int
carp_ioctl(struct ifreq * ifr,u_long cmd,struct thread * td)2387 carp_ioctl(struct ifreq *ifr, u_long cmd, struct thread *td)
2388 {
2389 struct carpreq carpr;
2390 struct carpkreq carprk = {
2391 .carpr_version = CARP_VERSION_CARP,
2392 };
2393 struct ifnet *ifp;
2394 int error = 0;
2395
2396 if ((error = copyin(ifr_data_get_ptr(ifr), &carpr, sizeof carpr)))
2397 return (error);
2398
2399 ifp = ifunit_ref(ifr->ifr_name);
2400 if ((error = carp_is_supported_if(ifp)) != 0)
2401 goto out;
2402
2403 if ((ifp->if_flags & IFF_MULTICAST) == 0) {
2404 error = EADDRNOTAVAIL;
2405 goto out;
2406 }
2407
2408 sx_xlock(&carp_sx);
2409 switch (cmd) {
2410 case SIOCSVH:
2411 if ((error = priv_check(td, PRIV_NETINET_CARP)))
2412 break;
2413
2414 memcpy(&carprk, &carpr, sizeof(carpr));
2415 error = carp_ioctl_set(ifp, &carprk);
2416 break;
2417
2418 case SIOCGVH:
2419 error = carp_ioctl_get(ifp, td->td_ucred, &carpr,
2420 carp_carprcp, &carpr);
2421 if (error == 0) {
2422 error = copyout(&carpr,
2423 (char *)ifr_data_get_ptr(ifr),
2424 carpr.carpr_count * sizeof(carpr));
2425 }
2426 break;
2427 default:
2428 error = EINVAL;
2429 }
2430 sx_xunlock(&carp_sx);
2431
2432 out:
2433 if (ifp != NULL)
2434 if_rele(ifp);
2435
2436 return (error);
2437 }
2438
2439 static int
carp_get_vhid(struct ifaddr * ifa)2440 carp_get_vhid(struct ifaddr *ifa)
2441 {
2442
2443 if (ifa == NULL || ifa->ifa_carp == NULL)
2444 return (0);
2445
2446 return (ifa->ifa_carp->sc_vhid);
2447 }
2448
2449 int
carp_attach(struct ifaddr * ifa,int vhid)2450 carp_attach(struct ifaddr *ifa, int vhid)
2451 {
2452 struct ifnet *ifp = ifa->ifa_ifp;
2453 struct carp_if *cif = ifp->if_carp;
2454 struct carp_softc *sc;
2455 int index, error;
2456
2457 KASSERT(ifa->ifa_carp == NULL, ("%s: ifa %p attached", __func__, ifa));
2458
2459 switch (ifa->ifa_addr->sa_family) {
2460 #ifdef INET
2461 case AF_INET:
2462 #endif
2463 #ifdef INET6
2464 case AF_INET6:
2465 #endif
2466 break;
2467 default:
2468 return (EPROTOTYPE);
2469 }
2470
2471 sx_xlock(&carp_sx);
2472 if (ifp->if_carp == NULL) {
2473 sx_xunlock(&carp_sx);
2474 return (ENOPROTOOPT);
2475 }
2476
2477 IFNET_FOREACH_CARP(ifp, sc)
2478 if (sc->sc_vhid == vhid)
2479 break;
2480 if (sc == NULL) {
2481 sx_xunlock(&carp_sx);
2482 return (ENOENT);
2483 }
2484
2485 error = carp_multicast_setup(cif, ifa->ifa_addr->sa_family);
2486 if (error) {
2487 CIF_FREE(cif);
2488 sx_xunlock(&carp_sx);
2489 return (error);
2490 }
2491
2492 index = sc->sc_naddrs + sc->sc_naddrs6 + 1;
2493 if (index > sc->sc_ifasiz / sizeof(struct ifaddr *))
2494 carp_grow_ifas(sc);
2495
2496 switch (ifa->ifa_addr->sa_family) {
2497 #ifdef INET
2498 case AF_INET:
2499 cif->cif_naddrs++;
2500 sc->sc_naddrs++;
2501 break;
2502 #endif
2503 #ifdef INET6
2504 case AF_INET6:
2505 cif->cif_naddrs6++;
2506 sc->sc_naddrs6++;
2507 break;
2508 #endif
2509 }
2510
2511 ifa_ref(ifa);
2512
2513 CARP_LOCK(sc);
2514 sc->sc_ifas[index - 1] = ifa;
2515 ifa->ifa_carp = sc;
2516 if (sc->sc_version == CARP_VERSION_CARP)
2517 carp_hmac_prepare(sc);
2518 carp_sc_state(sc);
2519 CARP_UNLOCK(sc);
2520
2521 sx_xunlock(&carp_sx);
2522
2523 return (0);
2524 }
2525
2526 void
carp_detach(struct ifaddr * ifa,bool keep_cif)2527 carp_detach(struct ifaddr *ifa, bool keep_cif)
2528 {
2529 struct ifnet *ifp = ifa->ifa_ifp;
2530 struct carp_if *cif = ifp->if_carp;
2531 struct carp_softc *sc = ifa->ifa_carp;
2532 int i, index;
2533
2534 KASSERT(sc != NULL, ("%s: %p not attached", __func__, ifa));
2535
2536 sx_xlock(&carp_sx);
2537
2538 CARP_LOCK(sc);
2539 /* Shift array. */
2540 index = sc->sc_naddrs + sc->sc_naddrs6;
2541 for (i = 0; i < index; i++)
2542 if (sc->sc_ifas[i] == ifa)
2543 break;
2544 KASSERT(i < index, ("%s: %p no backref", __func__, ifa));
2545 for (; i < index - 1; i++)
2546 sc->sc_ifas[i] = sc->sc_ifas[i+1];
2547 sc->sc_ifas[index - 1] = NULL;
2548
2549 switch (ifa->ifa_addr->sa_family) {
2550 #ifdef INET
2551 case AF_INET:
2552 cif->cif_naddrs--;
2553 sc->sc_naddrs--;
2554 break;
2555 #endif
2556 #ifdef INET6
2557 case AF_INET6:
2558 cif->cif_naddrs6--;
2559 sc->sc_naddrs6--;
2560 break;
2561 #endif
2562 }
2563
2564 carp_ifa_delroute(ifa);
2565 carp_multicast_cleanup(cif, ifa->ifa_addr->sa_family);
2566
2567 ifa->ifa_carp = NULL;
2568 ifa_free(ifa);
2569
2570 if (sc->sc_version == CARP_VERSION_CARP)
2571 carp_hmac_prepare(sc);
2572 carp_sc_state(sc);
2573
2574 if (!keep_cif && sc->sc_naddrs == 0 && sc->sc_naddrs6 == 0)
2575 carp_destroy(sc);
2576 else
2577 CARP_UNLOCK(sc);
2578
2579 if (!keep_cif)
2580 CIF_FREE(cif);
2581
2582 sx_xunlock(&carp_sx);
2583 }
2584
2585 static void
carp_set_state(struct carp_softc * sc,int state,const char * reason)2586 carp_set_state(struct carp_softc *sc, int state, const char *reason)
2587 {
2588
2589 CARP_LOCK_ASSERT(sc);
2590
2591 if (sc->sc_state != state) {
2592 const char *carp_states[] = { CARP_STATES };
2593 char subsys[IFNAMSIZ+5];
2594
2595 snprintf(subsys, IFNAMSIZ+5, "%u@%s", sc->sc_vhid,
2596 if_name(sc->sc_carpdev));
2597
2598 CARP_LOG("%s: %s -> %s (%s)\n", subsys,
2599 carp_states[sc->sc_state], carp_states[state], reason);
2600
2601 sc->sc_state = state;
2602
2603 devctl_notify("CARP", subsys, carp_states[state], NULL);
2604 }
2605 }
2606
2607 static void
carp_linkstate(struct ifnet * ifp)2608 carp_linkstate(struct ifnet *ifp)
2609 {
2610 struct carp_softc *sc;
2611
2612 CIF_LOCK(ifp->if_carp);
2613 IFNET_FOREACH_CARP(ifp, sc) {
2614 CARP_LOCK(sc);
2615 carp_sc_state(sc);
2616 CARP_UNLOCK(sc);
2617 }
2618 CIF_UNLOCK(ifp->if_carp);
2619 }
2620
2621 static void
carp_sc_state(struct carp_softc * sc)2622 carp_sc_state(struct carp_softc *sc)
2623 {
2624
2625 CARP_LOCK_ASSERT(sc);
2626
2627 if (sc->sc_carpdev->if_link_state != LINK_STATE_UP ||
2628 !(sc->sc_carpdev->if_flags & IFF_UP) ||
2629 !V_carp_allow) {
2630 callout_stop(&sc->sc_ad_tmo);
2631 #ifdef INET
2632 callout_stop(&sc->sc_md_tmo);
2633 #endif
2634 #ifdef INET6
2635 callout_stop(&sc->sc_md6_tmo);
2636 #endif
2637 carp_set_state(sc, INIT, "hardware interface down");
2638 carp_setrun(sc, 0);
2639 carp_delroute(sc);
2640 if (!sc->sc_suppress)
2641 carp_demote_adj(V_carp_ifdown_adj, "interface down");
2642 sc->sc_suppress = 1;
2643 } else {
2644 carp_set_state(sc, INIT, "hardware interface up");
2645 carp_setrun(sc, 0);
2646 if (sc->sc_suppress)
2647 carp_demote_adj(-V_carp_ifdown_adj, "interface up");
2648 sc->sc_suppress = 0;
2649 }
2650 }
2651
2652 static void
carp_demote_adj(int adj,char * reason)2653 carp_demote_adj(int adj, char *reason)
2654 {
2655 atomic_add_int(&V_carp_demotion, adj);
2656 CARP_LOG("demoted by %d to %d (%s)\n", adj, V_carp_demotion, reason);
2657 taskqueue_enqueue(taskqueue_swi, &carp_sendall_task);
2658 }
2659
2660 static int
carp_allow_sysctl(SYSCTL_HANDLER_ARGS)2661 carp_allow_sysctl(SYSCTL_HANDLER_ARGS)
2662 {
2663 int new, error;
2664 struct carp_softc *sc;
2665
2666 new = V_carp_allow;
2667 error = sysctl_handle_int(oidp, &new, 0, req);
2668 if (error || !req->newptr)
2669 return (error);
2670
2671 if (V_carp_allow != new) {
2672 V_carp_allow = new;
2673
2674 mtx_lock(&carp_mtx);
2675 LIST_FOREACH(sc, &carp_list, sc_next) {
2676 CARP_LOCK(sc);
2677 if (curvnet == sc->sc_carpdev->if_vnet)
2678 carp_sc_state(sc);
2679 CARP_UNLOCK(sc);
2680 }
2681 mtx_unlock(&carp_mtx);
2682 }
2683
2684 return (0);
2685 }
2686
2687 static int
carp_dscp_sysctl(SYSCTL_HANDLER_ARGS)2688 carp_dscp_sysctl(SYSCTL_HANDLER_ARGS)
2689 {
2690 int new, error;
2691
2692 new = V_carp_dscp;
2693 error = sysctl_handle_int(oidp, &new, 0, req);
2694 if (error || !req->newptr)
2695 return (error);
2696
2697 if (new < 0 || new > 63)
2698 return (EINVAL);
2699
2700 V_carp_dscp = new;
2701
2702 return (0);
2703 }
2704
2705 static int
carp_demote_adj_sysctl(SYSCTL_HANDLER_ARGS)2706 carp_demote_adj_sysctl(SYSCTL_HANDLER_ARGS)
2707 {
2708 int new, error;
2709
2710 new = V_carp_demotion;
2711 error = sysctl_handle_int(oidp, &new, 0, req);
2712 if (error || !req->newptr)
2713 return (error);
2714
2715 carp_demote_adj(new, "sysctl");
2716
2717 return (0);
2718 }
2719
2720 static int
nlattr_get_carp_key(struct nlattr * nla,struct nl_pstate * npt,const void * arg,void * target)2721 nlattr_get_carp_key(struct nlattr *nla, struct nl_pstate *npt, const void *arg, void *target)
2722 {
2723 if (__predict_false(NLA_DATA_LEN(nla) > CARP_KEY_LEN))
2724 return (EINVAL);
2725
2726 memcpy(target, NLA_DATA_CONST(nla), NLA_DATA_LEN(nla));
2727 return (0);
2728 }
2729
2730 struct carp_nl_send_args {
2731 struct nlmsghdr *hdr;
2732 struct nl_pstate *npt;
2733 };
2734
2735 static bool
carp_nl_send(void * arg,struct carp_softc * sc,int priv)2736 carp_nl_send(void *arg, struct carp_softc *sc, int priv)
2737 {
2738 struct carp_nl_send_args *nlsa = arg;
2739 struct nlmsghdr *hdr = nlsa->hdr;
2740 struct nl_pstate *npt = nlsa->npt;
2741 struct nl_writer *nw = npt->nw;
2742 struct genlmsghdr *ghdr_new;
2743
2744 if (!nlmsg_reply(nw, hdr, sizeof(struct genlmsghdr))) {
2745 nlmsg_abort(nw);
2746 return (false);
2747 }
2748
2749 ghdr_new = nlmsg_reserve_object(nw, struct genlmsghdr);
2750 if (ghdr_new == NULL) {
2751 nlmsg_abort(nw);
2752 return (false);
2753 }
2754
2755 ghdr_new->cmd = CARP_NL_CMD_GET;
2756 ghdr_new->version = 0;
2757 ghdr_new->reserved = 0;
2758
2759 CARP_LOCK(sc);
2760
2761 nlattr_add_u32(nw, CARP_NL_VHID, sc->sc_vhid);
2762 nlattr_add_u32(nw, CARP_NL_STATE, sc->sc_state);
2763 nlattr_add_u8(nw, CARP_NL_VERSION, sc->sc_version);
2764 switch (sc->sc_version) {
2765 case CARP_VERSION_CARP:
2766 nlattr_add_s32(nw, CARP_NL_ADVBASE, sc->sc_advbase);
2767 nlattr_add_s32(nw, CARP_NL_ADVSKEW, sc->sc_advskew);
2768 nlattr_add_in_addr(nw, CARP_NL_ADDR, &sc->sc_carpaddr);
2769 nlattr_add_in6_addr(nw, CARP_NL_ADDR6, &sc->sc_carpaddr6);
2770 if (priv)
2771 nlattr_add(nw, CARP_NL_KEY, sizeof(sc->sc_key),
2772 sc->sc_key);
2773 break;
2774 case CARP_VERSION_VRRPv3:
2775 nlattr_add_u8(nw, CARP_NL_VRRP_PRIORITY, sc->sc_vrrp_prio);
2776 nlattr_add_u16(nw, CARP_NL_VRRP_ADV_INTER,
2777 sc->sc_vrrp_adv_inter);
2778 break;
2779 }
2780
2781 CARP_UNLOCK(sc);
2782
2783 if (! nlmsg_end(nw)) {
2784 nlmsg_abort(nw);
2785 return (false);
2786 }
2787
2788 return (true);
2789 }
2790
2791 struct nl_carp_parsed {
2792 unsigned int ifindex;
2793 char *ifname;
2794 uint32_t state;
2795 uint32_t vhid;
2796 int32_t advbase;
2797 int32_t advskew;
2798 char key[CARP_KEY_LEN];
2799 struct in_addr addr;
2800 struct in6_addr addr6;
2801 carp_version_t version;
2802 uint8_t vrrp_prio;
2803 uint16_t vrrp_adv_inter;
2804 };
2805
2806 #define _IN(_field) offsetof(struct genlmsghdr, _field)
2807 #define _OUT(_field) offsetof(struct nl_carp_parsed, _field)
2808
2809 static const struct nlattr_parser nla_p_set[] = {
2810 { .type = CARP_NL_VHID, .off = _OUT(vhid), .cb = nlattr_get_uint32 },
2811 { .type = CARP_NL_STATE, .off = _OUT(state), .cb = nlattr_get_uint32 },
2812 { .type = CARP_NL_ADVBASE, .off = _OUT(advbase), .cb = nlattr_get_uint32 },
2813 { .type = CARP_NL_ADVSKEW, .off = _OUT(advskew), .cb = nlattr_get_uint32 },
2814 { .type = CARP_NL_KEY, .off = _OUT(key), .cb = nlattr_get_carp_key },
2815 { .type = CARP_NL_IFINDEX, .off = _OUT(ifindex), .cb = nlattr_get_uint32 },
2816 { .type = CARP_NL_ADDR, .off = _OUT(addr), .cb = nlattr_get_in_addr },
2817 { .type = CARP_NL_ADDR6, .off = _OUT(addr6), .cb = nlattr_get_in6_addr },
2818 { .type = CARP_NL_IFNAME, .off = _OUT(ifname), .cb = nlattr_get_string },
2819 { .type = CARP_NL_VERSION, .off = _OUT(version), .cb = nlattr_get_uint8 },
2820 { .type = CARP_NL_VRRP_PRIORITY, .off = _OUT(vrrp_prio), .cb = nlattr_get_uint8 },
2821 { .type = CARP_NL_VRRP_ADV_INTER, .off = _OUT(vrrp_adv_inter), .cb = nlattr_get_uint16 },
2822 };
2823 static const struct nlfield_parser nlf_p_set[] = {
2824 };
2825 NL_DECLARE_PARSER(carp_parser, struct genlmsghdr, nlf_p_set, nla_p_set);
2826 #undef _IN
2827 #undef _OUT
2828
2829
2830 static int
carp_nl_get(struct nlmsghdr * hdr,struct nl_pstate * npt)2831 carp_nl_get(struct nlmsghdr *hdr, struct nl_pstate *npt)
2832 {
2833 struct nl_carp_parsed attrs = { };
2834 struct carp_nl_send_args args;
2835 struct carpreq carpr = { };
2836 struct epoch_tracker et;
2837 if_t ifp = NULL;
2838 int error;
2839
2840 error = nl_parse_nlmsg(hdr, &carp_parser, npt, &attrs);
2841 if (error != 0)
2842 return (error);
2843
2844 NET_EPOCH_ENTER(et);
2845 if (attrs.ifname != NULL)
2846 ifp = ifunit_ref(attrs.ifname);
2847 else if (attrs.ifindex != 0)
2848 ifp = ifnet_byindex_ref(attrs.ifindex);
2849 NET_EPOCH_EXIT(et);
2850
2851 if ((error = carp_is_supported_if(ifp)) != 0)
2852 goto out;
2853
2854 hdr->nlmsg_flags |= NLM_F_MULTI;
2855 args.hdr = hdr;
2856 args.npt = npt;
2857
2858 carpr.carpr_vhid = attrs.vhid;
2859 carpr.carpr_count = CARP_MAXVHID;
2860
2861 sx_xlock(&carp_sx);
2862 error = carp_ioctl_get(ifp, nlp_get_cred(npt->nlp), &carpr,
2863 carp_nl_send, &args);
2864 sx_xunlock(&carp_sx);
2865
2866 if (! nlmsg_end_dump(npt->nw, error, hdr))
2867 error = ENOMEM;
2868
2869 out:
2870 if (ifp != NULL)
2871 if_rele(ifp);
2872
2873 return (error);
2874 }
2875
2876 static int
carp_nl_set(struct nlmsghdr * hdr,struct nl_pstate * npt)2877 carp_nl_set(struct nlmsghdr *hdr, struct nl_pstate *npt)
2878 {
2879 struct nl_carp_parsed attrs = { };
2880 struct carpkreq carpr;
2881 struct epoch_tracker et;
2882 if_t ifp = NULL;
2883 int error;
2884
2885 error = nl_parse_nlmsg(hdr, &carp_parser, npt, &attrs);
2886 if (error != 0)
2887 return (error);
2888
2889 if (attrs.vhid <= 0 || attrs.vhid > CARP_MAXVHID)
2890 return (EINVAL);
2891 if (attrs.state > CARP_MAXSTATE)
2892 return (EINVAL);
2893 if (attrs.version == 0) /* compat with pre-VRRPv3 */
2894 attrs.version = CARP_VERSION_CARP;
2895 switch (attrs.version) {
2896 case CARP_VERSION_CARP:
2897 if (attrs.advbase < 0 || attrs.advskew < 0)
2898 return (EINVAL);
2899 if (attrs.advbase > 255)
2900 return (EINVAL);
2901 if (attrs.advskew >= 255)
2902 return (EINVAL);
2903 break;
2904 case CARP_VERSION_VRRPv3:
2905 if (attrs.vrrp_adv_inter > VRRP_MAX_INTERVAL)
2906 return (EINVAL);
2907 break;
2908 default:
2909 return (EINVAL);
2910 }
2911
2912 NET_EPOCH_ENTER(et);
2913 if (attrs.ifname != NULL)
2914 ifp = ifunit_ref(attrs.ifname);
2915 else if (attrs.ifindex != 0)
2916 ifp = ifnet_byindex_ref(attrs.ifindex);
2917 NET_EPOCH_EXIT(et);
2918
2919 if ((error = carp_is_supported_if(ifp)) != 0)
2920 goto out;
2921
2922 if ((ifp->if_flags & IFF_MULTICAST) == 0) {
2923 error = EADDRNOTAVAIL;
2924 goto out;
2925 }
2926
2927 carpr.carpr_count = 1;
2928 carpr.carpr_vhid = attrs.vhid;
2929 carpr.carpr_state = attrs.state;
2930 carpr.carpr_version = attrs.version;
2931 switch (attrs.version) {
2932 case CARP_VERSION_CARP:
2933 carpr.carpr_advbase = attrs.advbase;
2934 carpr.carpr_advskew = attrs.advskew;
2935 carpr.carpr_addr = attrs.addr;
2936 carpr.carpr_addr6 = attrs.addr6;
2937 memcpy(&carpr.carpr_key, &attrs.key, sizeof(attrs.key));
2938 break;
2939 case CARP_VERSION_VRRPv3:
2940 carpr.carpr_vrrp_priority = attrs.vrrp_prio;
2941 carpr.carpr_vrrp_adv_inter = attrs.vrrp_adv_inter;
2942 break;
2943 }
2944
2945 sx_xlock(&carp_sx);
2946 error = carp_ioctl_set(ifp, &carpr);
2947 sx_xunlock(&carp_sx);
2948
2949 out:
2950 if (ifp != NULL)
2951 if_rele(ifp);
2952
2953 return (error);
2954 }
2955
2956 static const struct nlhdr_parser *all_parsers[] = {
2957 &carp_parser
2958 };
2959
2960 static const struct genl_cmd carp_cmds[] = {
2961 {
2962 .cmd_num = CARP_NL_CMD_GET,
2963 .cmd_name = "SIOCGVH",
2964 .cmd_cb = carp_nl_get,
2965 .cmd_flags = GENL_CMD_CAP_DO | GENL_CMD_CAP_DUMP |
2966 GENL_CMD_CAP_HASPOL,
2967 },
2968 {
2969 .cmd_num = CARP_NL_CMD_SET,
2970 .cmd_name = "SIOCSVH",
2971 .cmd_cb = carp_nl_set,
2972 .cmd_flags = GENL_CMD_CAP_DO | GENL_CMD_CAP_HASPOL,
2973 .cmd_priv = PRIV_NETINET_CARP,
2974 },
2975 };
2976
2977 static void
carp_nl_register(void)2978 carp_nl_register(void)
2979 {
2980 bool ret __diagused;
2981 int family_id __diagused;
2982
2983 NL_VERIFY_PARSERS(all_parsers);
2984 family_id = genl_register_family(CARP_NL_FAMILY_NAME, 0, 2,
2985 CARP_NL_CMD_MAX);
2986 MPASS(family_id != 0);
2987
2988 ret = genl_register_cmds(CARP_NL_FAMILY_NAME, carp_cmds,
2989 NL_ARRAY_LEN(carp_cmds));
2990 MPASS(ret);
2991 }
2992
2993 static void
carp_nl_unregister(void)2994 carp_nl_unregister(void)
2995 {
2996 genl_unregister_family(CARP_NL_FAMILY_NAME);
2997 }
2998
2999 static void
carp_mod_cleanup(void)3000 carp_mod_cleanup(void)
3001 {
3002
3003 carp_nl_unregister();
3004
3005 #ifdef INET
3006 (void)ipproto_unregister(IPPROTO_CARP);
3007 carp_iamatch_p = NULL;
3008 #endif
3009 #ifdef INET6
3010 (void)ip6proto_unregister(IPPROTO_CARP);
3011 carp_iamatch6_p = NULL;
3012 carp_macmatch6_p = NULL;
3013 #endif
3014 carp_ioctl_p = NULL;
3015 carp_attach_p = NULL;
3016 carp_detach_p = NULL;
3017 carp_get_vhid_p = NULL;
3018 carp_linkstate_p = NULL;
3019 carp_forus_p = NULL;
3020 carp_output_p = NULL;
3021 carp_demote_adj_p = NULL;
3022 carp_master_p = NULL;
3023 mtx_unlock(&carp_mtx);
3024 taskqueue_drain(taskqueue_swi, &carp_sendall_task);
3025 mtx_destroy(&carp_mtx);
3026 sx_destroy(&carp_sx);
3027 }
3028
3029 static void
ipcarp_sysinit(void)3030 ipcarp_sysinit(void)
3031 {
3032
3033 /* Load allow as tunable so to postpone carp start after module load */
3034 TUNABLE_INT_FETCH("net.inet.carp.allow", &V_carp_allow);
3035 }
3036 VNET_SYSINIT(ip_carp, SI_SUB_PROTO_DOMAIN, SI_ORDER_ANY, ipcarp_sysinit, NULL);
3037
3038 static int
carp_mod_load(void)3039 carp_mod_load(void)
3040 {
3041 int err;
3042
3043 mtx_init(&carp_mtx, "carp_mtx", NULL, MTX_DEF);
3044 sx_init(&carp_sx, "carp_sx");
3045 LIST_INIT(&carp_list);
3046 carp_get_vhid_p = carp_get_vhid;
3047 carp_forus_p = carp_forus;
3048 carp_output_p = carp_output;
3049 carp_linkstate_p = carp_linkstate;
3050 carp_ioctl_p = carp_ioctl;
3051 carp_attach_p = carp_attach;
3052 carp_detach_p = carp_detach;
3053 carp_demote_adj_p = carp_demote_adj;
3054 carp_master_p = carp_master;
3055 #ifdef INET6
3056 carp_iamatch6_p = carp_iamatch6;
3057 carp_macmatch6_p = carp_macmatch6;
3058 err = ip6proto_register(IPPROTO_CARP, carp6_input, NULL);
3059 if (err) {
3060 printf("carp: error %d registering with INET6\n", err);
3061 carp_mod_cleanup();
3062 return (err);
3063 }
3064 #endif
3065 #ifdef INET
3066 carp_iamatch_p = carp_iamatch;
3067 err = ipproto_register(IPPROTO_CARP, carp_input, NULL);
3068 if (err) {
3069 printf("carp: error %d registering with INET\n", err);
3070 carp_mod_cleanup();
3071 return (err);
3072 }
3073 #endif
3074
3075 carp_nl_register();
3076
3077 return (0);
3078 }
3079
3080 static int
carp_modevent(module_t mod,int type,void * data)3081 carp_modevent(module_t mod, int type, void *data)
3082 {
3083 switch (type) {
3084 case MOD_LOAD:
3085 return carp_mod_load();
3086 /* NOTREACHED */
3087 case MOD_UNLOAD:
3088 mtx_lock(&carp_mtx);
3089 if (LIST_EMPTY(&carp_list))
3090 carp_mod_cleanup();
3091 else {
3092 mtx_unlock(&carp_mtx);
3093 return (EBUSY);
3094 }
3095 break;
3096
3097 default:
3098 return (EINVAL);
3099 }
3100
3101 return (0);
3102 }
3103
3104 static moduledata_t carp_mod = {
3105 "carp",
3106 carp_modevent,
3107 0
3108 };
3109
3110 DECLARE_MODULE(carp, carp_mod, SI_SUB_PROTO_DOMAIN, SI_ORDER_ANY);
3111